Updated 3 October 2026
At a glance
- A large smartphone study analyzed daily data from 2,658 patients with chronic pain over 15 months and found significant yet modest links between pain and humidity, pressure and wind speed (npj Digital Medicine).
- In a follow-up analysis, 1 in 10 patients with chronic pain were sensitive to temperature, 1 in 25 to relative humidity, 1 in 50 to pressure and 3 in 100 to wind speed (Pain Reports).
- WHO estimates that endometriosis affects 10% (190 million) of reproductive age women worldwide (WHO).
- Endometriosis Journey keeps a weather line, pelvic pain, cycle dates and flare days in one dated history, and exports a one-page Doctor Report for the visit.
Many people with endometriosis notice that some days of pain follow a change in the weather. Others notice nothing. Research on weather and pain exists, and it shows modest links for groups and different answers for individuals.
This guide shows how to check your own record without turning it into extra work: a one-line weather note, the same pain entry every day, a monthly four-box count, the point at which weather notes should wait, and the pages to bring to the visit.
What studies found about weather and pain, and what that means for endometriosis: humidity, pressure, wind, and temperature
Most research on weather and pain covers chronic pain in general, since studies on endometriosis pain alone are scarce. The largest is the Cloudy with a Chance of Pain study, described in npj Digital Medicine. It analyzed daily data from 2,658 patients over 15 months and found significant yet modest relationships between pain and relative humidity, pressure and wind speed. The relationships remained after mood and physical activity were taken into account.
Higher humidity, higher wind speed and lower pressure went with more pain. (Source: pmc.ncbi.nlm.nih.gov.) Relative humidity had the strongest association and temperature the weakest. (Source: pmc.ncbi.nlm.nih.gov.) The authors write that the worst combination of weather variables would raise the odds of a pain event by just over 20% compared with an average day. (Source: pmc.ncbi.nlm.nih.gov.)
People differed from one another. A follow-up analysis in Pain Reports found that 1 in 10 patients with chronic pain were sensitive to temperature, 1 in 25 to relative humidity, 1 in 50 to pressure and 3 in 100 to wind speed. The direction of the association differed between people.
Weather may matter for you, may matter in the opposite direction from someone else, or may have no visible effect. A short, consistent log answers that for one person.
Does your own pain follow the weather? In Endometriosis Journey (by Health Journey Labs), the Daily check-in records pelvic pain, fatigue, bowel or bladder symptoms and external factors in one entry, so a weather line and a pain level share a date. The calendar view colors days by intensity, which lets months of entries be compared with the weather you wrote down.
Cycle days, bowel and bladder symptoms, fatigue, and mood: other reasons endometriosis pain changes
WHO describes endometriosis as a chronic disease whose symptoms include severe pain during menstruation, heavy menstrual bleeding, chronic pelvic pain, and abdominal bloating and nausea. With that many moving parts, a pain peak can have several explanations.
For scale, the same WHO fact sheet puts the global estimate at 10% of reproductive age women, or 190 million people.
ACOG adds that the amount of pain does not always match the severity of the condition. The weather study also found that mood was strongly and independently associated with pain events. A weather note is only useful alongside these other columns:
Table of symptoms by cycle day, by Endometriosis Journey
| Factor | What to write | Why it matters for a weather comparison |
|---|---|---|
| Cycle day | Bleeding days, start and stop dates. | Period days can explain pain with or without a weather change. |
| Bowel or bladder symptoms | Which ones, and whether they were worse than usual. | They add pain that has nothing to do with the sky. |
| Fatigue | Level for the day. | Low energy changes how pain is rated. |
| Mood | One word for the day. | Mood moves with pain in both directions. |
The guide to How to Cope With Endometriosis Fatigue covers the energy column in more depth.
Weather needs company in the log. The Period Tracker in Endometriosis Journey records start and stop dates, flow and how heavy or light bleeding felt, read together with pelvic pain, energy and bowel symptoms. The Daily check-in adds emotional state, so a hard day can be sorted into cycle, mood or weather.
One weather line per day with endometriosis: pressure trend, humidity, temperature, and wind
A weather line stays short when the words are fixed in advance. Pick the labels below once and reuse them. The reading comes from any forecast or weather report you already look at, and the log keeps your words for it.
Daily pressure, humidity and temperature
Endometriosis Journey keeps the weather to one line per day.
| Measure | Words to write |
|---|---|
| Pressure trend | Rising, falling or steady. |
| Humidity | High, average or low. |
| Temperature | Hot, mild or cold. |
| Wind | Windy or calm. |
These four measures match the ones in the studies above: humidity, pressure, wind speed and temperature. Rain and cloud cover add more columns without a clear reason to include them.
From Endometriosis Journey, we recommend writing the weather line after the pain entry for the day. The pain rating then comes first and is not shaped by what the forecast predicted. The guide to How to Start Tracking Endometriosis Before a Diagnosis describes the first weeks of a log like this.
Where does a weather line go? In Endometriosis Journey, the external factors section of the Daily check-in can hold it on the same date as the symptoms. Custom symptoms let you add your own label, such as "pressure falling", so the same words repeat from day to day and the history stays easy to compare.
The same endometriosis pain entry every day: pelvic pain, fatigue, bowel or bladder symptoms, and what you limited
A weather comparison works only when pain is described the same way every day. Four items are enough:
Daily pain entries in the same words
Endometriosis Journey uses the same words each day so entries can be compared.
- Pelvic pain: the level, in the same words or numbers you used the day before.
- Fatigue: the level for the day.
- Bowel or bladder symptoms: which ones and how they compare with a usual week.
- What work or plans you limited: one line.
The last item carries weight. ACOG says that the amount of pain does not always match the severity of the condition, and that endometriosis can cause pain so severe that it prevents normal activities. What a day limited gives a second measure of the same day.
Keep the wording identical from week to week (Endometriosis Journey checklist). When the same four items appear every day, a change in the weather line can be compared with a change in a stable record.
The Daily check-in in Endometriosis Journey carries these items as pelvic pain, fatigue, bowel or bladder symptoms and what work or plans you limited. Free-text or voice notes in the Daily Journal hold what the day limited in your own words, which gives the numbers a plain-language partner when the log is read months later.
Checking the weather once a day: a limit that keeps a log for endometriosis short
Many patients expect weather to affect pain. npj Digital Medicine says that patients with chronic pain commonly believe their pain is related to the weather, and that scientific evidence to support the belief is inconclusive. Counting days answers the question better than watching the forecast all day.
Four rules keep the weather part of the log small:
List for a once-a-day weather check, by Endometriosis Journey
- One weather line per day, written after the pain entry.
- No weather entries during a flare. Flag the day first and add the line when the day is over.
- A review once a month, with the monthly view, instead of a daily search for patterns.
- No guessing about tomorrow. The log holds what happened.
Between reviews, entries only need to be added. The patterns show up when enough days are in the record, and a clinician can help interpret them.
The weekly and monthly views in Endometriosis Journey color days by intensity, so the monthly review becomes a look at one screen. Days with a darker color can be read against the weather lines written for the same dates, and the calendar view shows how often the dark days cluster.
Flare days with endometriosis, with and without a weather change: a four-box count
A flare day is a day clearly worse than a usual week. Once a month, count flare days and weather-change days in four boxes. A weather-change day can mean pressure falling or humidity high, whichever you decided to watch.
Flares after a weather change
Endometriosis Journey counts flare days with and without a weather change.
| Flare day | No flare day | |
|---|---|---|
| Weather-change day | Box A. | Box B. |
| No weather change | Box C. | Box D. |
Compare the share of flare days in the top row, A out of A plus B, with the share in the bottom row, C out of C plus D. If the shares are close, the weather line shows little in your record. If the top share is clearly higher, bring the counts to the visit.
Count period days separately. Splitting each box into bleeding days and other days keeps cycle pain from showing up as a weather effect. Mixed results are common, since the PubMed analysis cited earlier found that the direction of the weather-pain association differed between people.
The Flare Tracker in Endometriosis Journey flags a day clearly worse than a usual week, with onset, intensity and a short note, and reads it against history across weeks to separate one-off rises from repeating patterns. The Period Tracker marks bleeding days, which splits each box of the count into period days and other days.
Sudden, severe, or new pain with endometriosis: contact a clinician before adding a weather note
A weather log belongs to ordinary days. When pain changes quickly, feels different from your usual pattern or simply worries you, contact a clinician. Weather lines can wait. If you think you are in danger, call your local emergency number (such as 911).
After the contact, a short factual note helps the next conversation:
List for recording new pain, by Endometriosis Journey
- The date the change began.
- Where the pain was and how it differed from your usual pattern, in your words.
- The cycle day or bleeding status.
- Any change in bowel or bladder symptoms, and what you had to cancel.
Leave out guesses about the cause, since a clinician interprets causes. Each fact has a place in the log: pain in the pain line, bleeding in the cycle line, bowel and bladder changes in their own line, and canceled plans in the limits line. The weather line for that date can be added afterward, if it still seems relevant.
Once help is in place, the Flare Tracker in Endometriosis Journey records the onset, the intensity and a short note for the day, which gives the clinician the start of the change in your own words and dates.
Monthly counts, cycle dates, and three questions about weather and endometriosis for the appointment
WHO says that a careful menstrual health history including pain, heaviness of bleeding and associated symptoms can help with diagnosis. ACOG says the clinician first may ask for a detailed health history and a list of your symptoms. A weather line becomes useful in that setting as one more column on a page that already has the basics.
Bring:
Monthly counts list, by Endometriosis Journey
- Cycle start dates and bleeding days for the last several months.
- The pain, fatigue, bowel or bladder entries, and what you limited.
- The four-box count for the last one or two months.
Write the questions as invitations to look at the record together:
- Is it worth reviewing the flare days that followed a pressure drop together?
- Is it worth reviewing the weeks around my period dates together?
- Is it worth reviewing the days I limited plans together?
For a longer list of items, see How to Prepare for a Short Endometriosis Doctor Visit.
For the visit, Endometriosis Journey exports a one-page Doctor Report from the logged history, with dates, pelvic pain, cycle timing, energy and how you functioned. My Care Team holds clinicians and short visit notes, with space for what to ask and bring, notes during the visit and review afterward.
How Endometriosis Journey can help
A paper notebook handles the weather line well, and a phone log adds the calendar view and the one-page summary. To compare apps, see Best Endometriosis Apps 2026.
Endometriosis Journey is a personal endometriosis tracker from Health Journey Labs on the App Store and Google Play. For weather, it lets you write one short line a day and read it against pelvic pain, cycle dates and flare days. After a few months the monthly view shows whether dark days gather on weather-change days or stay spread across the month. Below is what you can use and how each part helps.
- Daily check-in — A guided daily entry for physical symptoms, emotional state, nutrition, sleep, exercise, medicines and external factors, with pelvic pain, fatigue, bowel or bladder symptoms and what you limited.
- Daily Journal — Free-text or voice notes for what the day limited, a travel line or a visit debrief.
- Flare Tracker — Flags a day clearly worse than a usual week, with onset, intensity and a short note, so one-off rises can be told from repeating ones.
- My Meds — Keeps medicine names and entries as dated facts, including options you already use for pain as directed, read against pain weeks, energy and sleep.
- My Labs — Result dates for imaging, bloodwork and other tests, read against pain and function.
- Weekly Goals — One small aim for the week and whether it held.
- Learn — Short education topics on cycle pain, fatigue, pacing and visit prep, with prompts to read against your logged weeks.
- AI companions — Clara and the specialist companions see the logged history, so visit wording or a calm script starts from your real entries.
- My Care Team — Lists your clinicians and short visit notes, with room for visit prep, notes during the visit and review afterward.
- Doctor Report — The logged history condensed to one page for the clinician: dates, pelvic pain, cycle timing, energy and function.
- My Assessments — Structured check-ins beyond the daily scores, plus the life and social context from onboarding.
- Food Tracker — Meal and drink lines, read against pain, energy, bowel symptoms and flares.
- Period Tracker — Bleeding dates and flow, plus how heavy or light it felt, set against pelvic pain, energy and bowel symptoms.
- Weight Tracker — Scale or body notes, read against energy, sleep and pain.
Everything you log builds one history, and insights get stronger as it grows. Custom symptoms let you add your own labels.
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
- npj Digital Medicine (PMC) — How the weather affects the pain of citizen scientists using a smartphone app
- Pain Reports (PubMed) — Heterogeneity in the association between weather and pain severity among patients with chronic pain
- Gynecologic and Obstetric Investigation (PubMed) — Association between weather conditions and the incidence of emergency gynecological consultations
- World Health Organization — Endometriosis fact sheet
- ACOG — Endometriosis FAQs
FAQ
The answers below draw on the sources cited in this guide, and the app they mention is Endometriosis Journey (by Health Journey Labs).
Can weather change endometriosis pain?
The weather studies cited here covered chronic pain in general rather than endometriosis alone. A large smartphone study found significant yet modest links between pain and humidity, pressure and wind speed, and its authors call earlier evidence inconclusive.
Endometriosis Journey puts a weather line and the pelvic pain entry on the same date. After several months, the calendar view shows whether darker days fall on weather-change days in your own record, which is more direct than general studies.
Which matters most: pressure, humidity or temperature?
Group results and individual results point in different directions. Temperature stood out least across the group, yet 1 in 10 patients were individually sensitive to it. That gap is why logging all four measures for a few months says more than choosing one in advance.
In Endometriosis Journey, Custom symptoms let you label each measure the same way every day. When all four are logged, the history can show which one lines up with your own hard days, if any.
How do I record pressure without a barometer?
Use any weather report or forecast you already read and write one word: rising, falling or steady. The word describes the trend for that day, and writing it the same way each time matters more than recording an exact number.
Endometriosis Journey stores the word you choose in the daily entry, under external factors. Repeating the same word each day keeps the history comparable, which saves you from hunting for numbers later.
How do I tell weather effects from cycle effects?
Mark bleeding days and compare like with like: weather-change days within bleeding days against other bleeding days, and the same for non-bleeding days. WHO and ACOG both list menstrual pain among the core symptoms, so cycle pain is expected to shape the record.
Bleeding dates logged in Endometriosis Journey let you split the monthly count into period days and other days. That split keeps period pain from being mistaken for a weather effect, and it keeps the comparison fair.
How do I avoid checking the forecast all day?
Set one moment for the weather line, after the pain entry for the day, and one review each month. Between those moments, the log only needs the next entry. The large weather study worked from daily data.
The monthly view in Endometriosis Journey colors days by intensity, so the review fits one screen. Having a scheduled look means the rest of the month can go to the entries themselves.
What if my pain follows no weather pattern?
That result is useful. The PubMed analysis found that sensitivity to each weather measure applied to a small subgroup of patients, and that the direction differed between people. A record without a weather pattern lets you and a clinician focus on cycle, bowel, bladder and fatigue.
Endometriosis Journey keeps those other columns in the same history, so the Flare Tracker, the Period Tracker and the Daily check-in can be read together when the weather column shows no link, and the visit stays focused on what the record does show.
Does mood change how weather-related pain looks in my log?
The large weather study reported that mood was strongly and independently linked to pain events. Writing one word for mood each day lets you see whether a hard day was a low-mood day, a weather-change day or both.
Emotional state and physical symptoms land on one date in Endometriosis Journey. Mood and weather then become two separate columns, and you can see which one moves together with your pain over the weeks.
When should I contact a clinician instead of logging the weather?
A quick change, a pain unlike your usual pattern or simple worry are all reasons to reach a clinician. Weather lines can wait until the day is over. When the situation feels dangerous, your local emergency number (such as 911) is the call to make.
Afterward, Endometriosis Journey can hold a dated entry for the change in the Flare Tracker, with onset, intensity and a short note, so the clinician hears when it began in your words.
What weather information should I bring to the visit?
Bring counts, not forecasts: the four-box count for one or two months, cycle dates and the pain entries. These fit the history a clinician wants, since a menstrual health history with pain and bleeding details is part of how endometriosis is assessed.
A page exported from Endometriosis Journey puts dates, cycle timing and how you functioned in front of the clinician. The weather counts then travel together with the main symptoms instead of in a separate stack.
What can I ask a clinician about weather and pain?
Phrase each question as an invitation to look at the record together. One example: Is it worth reviewing the bleeding days with the highest pain together? A second: Is it worth reviewing the weeks with the most limits together?
My Care Team in Endometriosis Journey keeps visit prep with what to ask and bring, notes during the visit and review afterward. Questions and answers stay in the same history as the weeks they refer to.
Do hot days make pelvic pain worse?
A one-year review of emergency gynecology visits in Switzerland, in Gynecologic and Obstetric Investigation, found that high mean daily temperature was a significant predictor of visits for pelvic pain of unidentified origin. It covered several gynecologic symptoms and did not single out endometriosis.
With Endometriosis Journey, a temperature word in the weather line goes with the pelvic pain entry for the same day. Your own history shows whether hot days and hard days overlap often enough to mention to a clinician.
Can an AI chat help me read my weather log?
An AI chat can help you organize counts and draft questions, and a clinician interprets what they mean for your care. Share the monthly counts and the cycle dates so the conversation has dated facts to work from.
The AI companions in Endometriosis Journey, including Clara, see the logged history. A question about weather and flare days starts from your real entries and dates instead of from a general answer.
What if I travel or move between climates?
Write the weather where you were that day. A change of climate adds new combinations of humidity and temperature, which can make the record richer, and a note about the trip helps explain a cluster of entries.
The Daily Journal in Endometriosis Journey takes free-text or voice notes, so a travel line can go in the same entry as the weather line. Later reading then separates trip days from home days.
How common is endometriosis?
According to WHO, symptoms are variable and broad, which makes endometriosis hard to diagnose, and the average time to diagnosis is between 4 and 12 years. Many people keep notes for a long time before answers arrive.
Endometriosis Journey keeps pain, cycle dates and function in one dated history that grows over months. That history gives a clinician a clear sequence when the time comes to compare symptoms across a long wait.
Who should see my symptom notes, and what about privacy?
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.
With Endometriosis Journey, you decide which health notes to add. Read the app's privacy policy to see how data is stored and handled. This guide gives general information, not medical advice.