Updated 3 October 2026
At a glance
- A Beijing time-series study of 39,015 endometriosis-related outpatient visits linked high apparent temperature to more daily visits, with delayed effects across lag 0–14 days (BMC Public Health).
- In a 2022 analysis of the Cloudy with a Chance of Pain data, 1 in 10 patients with chronic pain were sensitive to temperature, 1 in 25 to relative humidity and 1 in 50 to pressure, and the direction differed between people (PubMed).
- In a survey of 236 people with endometriosis, about half (52.8%) could identify triggers for their flares, and around a third found flares not at all predictable (PMC).
- Three day labels, one four-part pain description and cycle dates in the same entry make cold, low-pressure and humid days comparable.
- Endometriosis Journey keeps Daily check-in scores, Flare Tracker flags and Period Tracker dates in one dated history, so each day label can be read against pain and cycle days.
Some people with endometriosis say cold days ache one way, falling-pressure days another way and humid days a third way. Others see no pattern at all. A log can tell these apart only if each kind of day gets its own label and the pain is described with the same words each time. Without that, every hard day gets blamed on "the weather" and the details are lost.
This guide covers what studies found for each weather variable and what they leave out, how to label cold, low-pressure and humid days, a four-part way to describe pain, the bowel, bladder and fatigue lines worth adding, why cycle days and delays matter, which other influences can look like weather, which medicine and test dates to keep, and how to prepare one page for a visit. It stays with logging and visit preparation. Diagnosis and treatment decisions belong with a clinician.
What studies found for temperature, pressure, and humidity with endometriosis, and what they leave out
No study cited here asks people with endometriosis how cold, pressure or humidity feel. What exists measures other outcomes, and each study points at a different weather variable. That gap is the reason to keep separate labels in a personal log.
- A Beijing time-series study analyzed 39,015 endometriosis-related outpatient visits from 2022 to 2024. High apparent temperature was associated with more daily visits, with nonlinear and delayed effects across lag 0–14 days (BMC Public Health). The outcome was visits, and the abstract reports no result for cold days.
- A 2001 Swiss study of gynecologic emergency consultations found that high mean daily temperature predicted pelvic pain, and that a rise in barometric pressure from the previous day predicted bleeding-related visits (PubMed). The group was not limited to endometriosis.
- In a 2022 analysis of smartphone data from patients with chronic pain, 1 in 10 were sensitive to temperature, 1 in 25 to relative humidity and 1 in 50 to pressure, and the direction of the association differed between people (PubMed).
A review of 43 studies on weather and musculoskeletal pain reached a similar place: for each weather variable, some studies found an association with pain, in either direction, and others did not (PubMed). Different variables, different outcomes and different people point toward one answer. Your own record, with each variable kept apart, is the only place the answer for you can appear.
The Daily check-in in Endometriosis Journey (by Health Journey Labs) records external factors with pelvic pain, fatigue, and bowel or bladder symptoms in one entry. The Flare Tracker reads history across weeks, which shows whether a rise was a one-off or a repeating pattern on one kind of day.
Three weather day labels for endometriosis: a cold day, a low-pressure day, and a humid day
A single "weather" note hides the difference this guide is about. Three labels keep the variables apart, and a fourth category supplies the comparison days. Write one label, or two when the day fits both, in the same entry as the pain description.
Table of weather day labels, by Endometriosis Journey
| Item | What to write |
|---|---|
| Cold day | Colder than usual for the season, in your own words. |
| Low-pressure day | Pressure falling or low, as reported by any weather source you already use. |
| Humid day | Air that feels sticky or heavy, or a humidity reading you trust. |
| Plain day | None of the three. |
Plain days matter as much as the labeled ones. Without them there is nothing to compare, and every labeled day looks like a pattern. Count mixed days, such as a cold and humid day, separately from single-label days. Mixed days tell you less about any one variable, and keeping them apart avoids reading a humid effect into a cold day.
The words are yours. What counts is using the same label for the same kind of day for the whole window, so that a review at the end compares like with like.
Custom symptoms in Endometriosis Journey let you add your own labels, so cold day, low-pressure day and humid day go in the same entry as the Daily check-in scores. The Daily Journal accepts free-text notes or voice entry for anything a label does not capture.
Describe endometriosis pain four ways: where, what kind, how fast, and how long
Cold, pressure and humidity may differ in how pain arrives as well as in how bad it is. A fixed description makes that visible. NICHD lists pain in the intestine or lower abdomen, painful bowel movements or urination during periods, and pain during or after sex among common symptoms (NICHD). Use plain site words for the same places each time.
From Endometriosis Journey, we recommend four lines for every labeled day:
Table for describing pain four ways, by Endometriosis Journey
| Item | What to write |
|---|---|
| Where | Lower abdomen, back, legs, bowel or bladder area, in your own words. |
| What kind | Stabbing, dull, heavy, burning or cramping, using the same words each time. |
| How fast | Sudden or building over hours. |
| How long | Under an hour, several hours or more than a day. |
The survey of 236 people with endometriosis defined flares as symptoms much worse than usual, and split them into short (under 1 hour), medium (1 hour to under 1 day) and long (over 1 day) (PMC). The median durations were 30 minutes, 5 hours and 3 days. Borrowing the three lengths gives the how-long line a shared scale, and a 0–10 score for intensity completes it.
The Flare Tracker in Endometriosis Journey flags a day clearly worse than a usual week, with onset, intensity and a short note, so the where, what kind, how fast and how long lines fit one flag. The Daily Journal holds the longer wording, typed or spoken.
Bowel, bladder, and fatigue lines: endometriosis symptoms that can move with pain on weather days
NICHD lists painful bowel movements or painful urination during menstrual periods, and notes that women with endometriosis may have painful bladder syndrome, digestive symptoms similar to a bowel disorder, and fatigue or lack of energy (NICHD). Those lines belong in a weather comparison for a practical reason. A cold day and a humid day may look alike on a pain score and different once bowel, bladder and fatigue lines are added.
Keep the extra lines short (Endometriosis Journey checklist):
Bowel, bladder and fatigue lines
Endometriosis Journey adds these lines to every weather entry.
| Item | What to write |
|---|---|
| Bowel | Any change, any pain with bowel movements, any urgency. |
| Bladder | Any pain or change in how often you went. |
| Fatigue | A 0–10 score, plus whether it came before or after the pain. |
| What the day limited | Work, plans or movement you dropped. |
Our guide to coping with endometriosis fatigue covers the fatigue side in more detail. For the weather question, the point is to write the same lines on every labeled day so the labels can be compared.
The Daily check-in in Endometriosis Journey carries pelvic pain, fatigue, bowel or bladder symptoms and what work or plans you limited. The Food Tracker records meal or drink lines, read with pain, energy, bowel symptoms and flares, so a bowel-heavy day can be checked against what was eaten.
Cycle day and delay with endometriosis: why the lead-up days count
In the survey of 236 people with endometriosis, the most common trigger for long flares was the menstrual cycle, with fatigue and stress also reported. About half (52.8%) could identify triggers for their flares, and around a third found flares not at all predictable (PMC). The questionnaire listed changes in season or weather among the possible triggers. The reported emphasis for long flares fell on the cycle, fatigue and stress.
The Beijing study found effects of high apparent temperature that were delayed across lag 0–14 days (BMC Public Health). Two habits follow from those findings:
Adding cycle day and delay to weather entries
Endometriosis Journey writes the cycle day on every weather entry.
- Write the cycle day, or the period start date, on every entry.
- At the review, read the days before a bad day as well as the day itself.
A bad day that lands in the first days of a period and also follows a low-pressure day is a different case from the same bad day in mid-cycle. Writing both facts down is cheap. Deciding which one mattered is a conversation for a visit.
The Period Tracker in Endometriosis Journey records start and stop dates, flow and how heavy or light bleeding felt, and reads them with pelvic pain, energy, bowel symptoms and everything else logged. A low-pressure day can then be placed on the cycle calendar with the pain days around it.
Standing, exercise, stress, and sleep: other reasons a day with endometriosis can look like weather
The same survey asked about triggers by flare length. For medium flares, prolonged standing and exercise or more physical activity than normal were reported frequently. For long flares, fatigue and stress were reported alongside the cycle (PMC). A cold day spent on your feet and a humid day spent on the couch are different days, even when the labels suggest a weather comparison.
Four extra lines in the same entry cover most of it:
Standing, exercise, stress and sleep
Endometriosis Journey records these as possible causes alongside the weather.
| Item | What to write |
|---|---|
| Time on your feet | A long day standing, a commute, a shift. |
| Activity above usual | Exercise, a move, a long walk. |
| Sleep | Hours the night before, and how the night went. |
| Stress as a fact | A deadline, a hard conversation, a trip. |
From Endometriosis Journey, we recommend writing these as short facts, not as explanations. At the review, a weather label that still lines up with pain after these lines are compared is stronger evidence than a label that only seemed to match.
One entry can hold all of it in Endometriosis Journey: the Daily check-in covers sleep, exercise and external factors, and the Daily Journal records what the day limited. The shared history strengthens insights as it grows, so the effect of a long day on your feet becomes visible against the day labels.
Medicine names, imaging, and lab dates to keep in one record for endometriosis
Medicine, imaging and lab dates
Endometriosis Journey records medicines and tests as dated facts.
Medicines and tests belong on the record as dated facts. List each medicine already in use, by name, so the record shows what was in use on each labeled day. Whether a medicine is connected to a hard day is a question for a prescriber, and the visit question takes the form "Is it worth reviewing the medicines list together?"
Keep three items:
- ☐ Each medicine in use, by name
- ☐ Date of any imaging or bloodwork
- ☐ Result, as the report words it
Do not interpret the numbers or the findings. NICHD notes that the severity of endometriosis pain does not correspond with the number, location or extent of lesions (NICHD). A scan date therefore explains little about a weather day, and it still gives the clinician a time reference for the log.
Our guide to tracking endometriosis labs against pain and cycle weeks covers the date side in more detail.
My Meds in Endometriosis Journey records medicine names, timing and medication entries, including options you already use for pain as directed, read with pain weeks, energy and sleep. My Labs records result dates for imaging, bloodwork and other tests, read with pain and function.
A one-page cycle summary for endometriosis at the appointment, and when to contact a clinician
In the survey, 35.3% of 236 people reported receiving advice from a healthcare provider about flares, and most did not contact a provider during a flare (PMC). A single page lets a short visit start from your own record. Window it to one full cycle, from one period start to the next, and bring:
- The cycle dates and the three labels used.
- The days where a label and a flare matched, and the days where they did not, with the plain days for comparison.
- The four-part pain description for two or three typical days.
- The bowel, bladder and fatigue lines for those days.
- The medicine list and any imaging or lab dates in the window.
Visit questions about weather and pain, by Endometriosis Journey
Write two questions in the form "Is it worth reviewing item together?" For example: "Is it worth reviewing the low-pressure days and the pain descriptions together?" or "Is it worth reviewing my cycle days and the longest flares together?" Our guide on what to bring to a 15-minute endometriosis visit covers the rest of the visit.
A sudden shift in symptoms, or any new or severe pain that worries you, is a reason to contact a clinician, whatever the weather labels say. If someone is in danger, call your local emergency number (911 in the United States).
The Doctor Report in Endometriosis Journey exports one page from the logged history, with dates, pelvic pain, cycle timing, energy and how you functioned. My Care Team keeps clinicians and short visit notes, which supports preparing questions, writing during the visit and reviewing afterward.
How Endometriosis Journey can help
A paper notebook or a phone note can hold three day labels and a four-part pain description. A tracker helps once those lines need to be read against cycle dates, bowel and bladder lines, sleep and medicines in one place. The comparison of options is in Best Endometriosis Apps 2026.
Endometriosis Journey is a personal endometriosis tracker from Health Journey Labs on the App Store and Google Play. For a weather question, it lets you write a day label with pelvic pain, fatigue and bowel or bladder lines in one entry, flag the days clearly worse than usual, and view the cycle on the calendar view with days colored by intensity. Over a cycle, the shared history shows whether a label repeats on the days your pain was worse, and the Doctor Report carries the answer to the visit on one page. Below is what you can use and how each part helps.
- Daily check-in — A guided daily form for physical symptoms, emotional state, nutrition, sleep, exercise, meds and external factors, with pelvic pain, fatigue, bowel or bladder symptoms and what work or plans you limited.
- Daily Journal — Free-text and voice notes for what the day limited, partner talks, fertility questions and visit debriefs, read with scores and other logged history for added context.
- Flare Tracker — Flags a day clearly worse than a usual week, with onset, intensity and a short note for pelvic pain, fatigue or bowel symptoms, compared with history across weeks.
- My Meds — Medicine names, timing and medication entries, including options you already use for pain as directed, read with pain weeks, energy and sleep.
- My Labs — Result dates for imaging, bloodwork and other tests, read with pain and function.
- Weekly Goals — One small aim for the week and whether it held, read with real check-ins.
- Learn — Short education topics and prompts on cycle pain, fatigue, pacing and visit prep, read with your own logged weeks.
- AI companions — Clara for general chat and specialist companions, which already see the logged history and help with visit wording or a calm partner script.
- My Care Team — Clinicians and short visit notes, used to prepare what to ask and bring, write during the visit and review afterward.
- Doctor Report — A one-page summary exported from the logged history, with dates, pelvic pain, cycle timing, energy and how you functioned, for a gynecology visit.
- My Assessments — Structured check-ins beyond the daily scores, plus onboarding life and social context, read with the ongoing history.
- Food Tracker — Meal or drink lines, read with pain, energy, bowel symptoms and flares.
- Period Tracker — Start and stop dates, flow and how heavy or light bleeding felt, read with pelvic pain, energy, bowel symptoms and everything else logged.
- Weight Tracker — Scale or body notes, read with energy, sleep and pain.
Each entry joins one history that grows with use, and insights get stronger as it does. Custom symptoms hold your own labels, such as cold day, low-pressure day and humid day.
We make Endometriosis Journey at Health Journey Labs. This guide is educational and does not replace medical advice. Diagnosis, medication decisions, and urgent care decisions belong with your treating clinicians.
Sources
- BMC Public Health — Independent and joint effects of apparent temperature and ambient air pollution on endometriosis-related outpatient visits in Beijing, China
- PMC (BJOG) — Symptom Flares in Endometriosis: Burden, Self-Management and Barriers to Care in a Cross-Sectional Survey
- PubMed — Association between weather conditions and the incidence of emergency gynecological consultations
- PubMed — Heterogeneity in the association between weather and pain severity among patients with chronic pain
- PubMed — Are weather conditions associated with chronic musculoskeletal pain? Review of results and methodologies
- NICHD — What are the symptoms of endometriosis?
FAQ
The answers below draw on the sources cited in this guide, and the app they mention is Endometriosis Journey (by Health Journey Labs).
Does weather affect endometriosis pain?
No study cited here measures how weather feels in endometriosis. A Beijing study linked high apparent temperature to more endometriosis-related outpatient visits, and chronic pain studies found mixed, person-specific associations, so a personal record gives the clearer answer.
Endometriosis Journey keeps a day label, pelvic pain and fatigue scores and cycle dates in one shared history. After a full cycle of entries you can see whether one kind of day lines up with your worse days.
How can I tell a cold day from a low-pressure day in my notes?
Give each its own label and describe the pain the same four ways on both: where, what kind, how fast and how long. If the descriptions differ, the labels are doing useful work, and if they match, the difference may be small.
A Custom symptoms label such as cold day or low-pressure day goes in the Daily check-in entry of Endometriosis Journey, so both labels stay in the entry with the pain and fatigue scores and can be compared across the weeks you logged.
Where do I find the air pressure for a day?
Any weather source you already use works. Write the pressure as falling, steady or rising, or note the reading if the source shows it, and use the same source for the whole window so the days are comparable.
The words you choose go into the external factors part of the Daily check-in, with the pain and fatigue scores for that date, so the label is whatever you decide to write and the source stays your choice.
Which words should I use to describe endometriosis pain?
Use your own words, and keep them fixed: where it is, what kind it feels like, whether it came on suddenly or built up, and how long it lasted. A 0–10 score for intensity completes the description, and the same words every time make the days comparable.
The Flare Tracker in Endometriosis Journey takes onset, intensity and a short note for a day clearly worse than usual, and the Daily Journal takes longer wording, typed or spoken, so the details of a bad day stay attached to its date.
Why does my pain seem to arrive days after a weather change?
The Beijing study found delayed associations across lag 0–14 days between high apparent temperature and outpatient visits. That is a finding about visit counts in a group, so the practical step for your own log is to read the days before a bad day as well as the day itself.
The calendar view in Endometriosis Journey shows days colored by intensity, so a run of low-pressure days followed by a worse stretch can be spotted without opening each entry one by one, and the lag becomes visible.
Can one day have two labels?
Yes, a cold and humid day is a real day, and it can carry both labels. Count mixed days apart from single-label days when you review, because they say less about any one variable and can blur a comparison.
Custom symptoms in Endometriosis Journey let you add your own labels, so a mixed day can be written with both words in the same entry and read as its own group when you go back through the history later.
How long should I keep the day labels going?
One full cycle, from one period start to the next, is a practical first window, since cycle days are part of the comparison. At the review, either stop the labels or keep them for one more cycle with a specific question.
The weekly and monthly views in Endometriosis Journey color days by intensity, so a whole cycle shows on one screen and the review begins from an overview, with no need to reread every single entry.
Do studies treat heat and cold the same way?
The studies cited look mainly at high temperature: the Beijing study at high apparent temperature, and the Swiss study at high mean daily temperature for pelvic pain visits. Neither reports a finding for cold days in endometriosis.
A cold day label in Endometriosis Journey is simply a note in the Daily check-in entry, kept alongside pelvic pain and fatigue scores. Your own cold days build their own record, which no study has covered for you.
How do I separate weather from my cycle?
Write the cycle day or the period start date on every entry, and compare labeled days that fall at similar points in the cycle. In the survey, the menstrual cycle was the most common trigger reported for long flares.
The Period Tracker in Endometriosis Journey records start and stop dates, flow and bleeding, and those dates are read with pelvic pain and energy, so a worse day can be placed on the cycle before any label is blamed.
What else can make a day look like weather?
In the survey, prolonged standing and more exercise than normal were frequent triggers for medium flares, and fatigue and stress for long flares. Write time on your feet, activity above usual, sleep and stress as short facts.
Sleep, exercise and external factors fit in a single Daily check-in entry in Endometriosis Journey, and the Daily Journal holds what the day limited, so a hard day can be read against more than the weather.
How do I record medicines while comparing weather days?
List each medicine already in use by name, as a dated fact, and leave out conclusions about cause. A prescriber is the person to judge, and the visit question is "Is it worth reviewing the medicines list together?"
Medicine names and medication entries go into My Meds in Endometriosis Journey, which reads them against pain weeks, energy and sleep, so the clinician sees what was in use on the labeled days without relying on recall.
What should I bring to a visit about this?
One page from a single cycle is enough for a first conversation: the cycle dates, the three labels, the matching and non-matching days, two or three four-part pain descriptions, the medicine list and any test dates.
The Doctor Report in Endometriosis Journey puts dates, pelvic pain, cycle timing, energy and how you functioned on one exported page, and the clinician can start with the matching days and the questions you wrote down.
When should I contact a clinician instead of logging?
Sudden, severe or new pain, or any change that worries you, is a reason to reach a clinician, whatever the weather labels say. Where there is danger, use your local emergency number (911 in the United States).
My Care Team in Endometriosis Journey keeps clinicians and short visit notes, and the logged history stays ready afterward, so the clinician can see how the days before the change looked, which makes the conversation more concrete.
Can ChatGPT or an app predict a weather-related flare?
A general chatbot sees none of your dated entries, and the studies cited show weather associations that vary between people and between variables. A chatbot can help you word a question, and the answer comes from a clinician who reviews your record.
AI companions in Endometriosis Journey, including Clara, already see the logged history. They can help turn a cycle of entries into a plain question for the clinician, grounded in your own days and labels.
How much privacy does my symptom record need?
Bleeding, pain during sex and fertility notes are personal, and partners, parents or coworkers may share a device with you. Use a screen lock, keep the log off family tablets, and choose which entries go to the gynecology visit.
The health notes in Endometriosis Journey are yours to keep or share. The app's privacy policy explains how data is stored and handled. Nothing in this article is medical advice.