--- title: "Endometriosis Flare-Ups: Symptoms, Triggers and What Helps" description: "What an endometriosis flare up feels like, how long it can last, possible triggers, what can ease the pain, when to get urgent help and what to log." canonical_url: "https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups" md_url: "https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups.md" last_updated: "2026-10-15" language: en --- # Endometriosis Flare-Ups: Symptoms, Triggers and What Helps An endometriosis flare is an episode of symptoms worse than your usual, most often pain. Here is what a flare can feel like, how long it can last, what may set it off, what can help and what to write down for your doctor. ![](https://junocompanion.com/_vercel/image?q=75&url=%2Fwebsite-assets%2Fmarshall-gould-headshot-v1.jpg&w=480) Published by [Marshall Gould](https://junocompanion.com/authors/marshall-gould) Published 15 October 2026Updated 15 October 20268 min read ![A woman in a headwrap lies on a sofa with her eyes closed, taking a rest.](https://junocompanion.com/_vercel/image?q=75&url=%2Fwebsite-assets%2Fjuno-blog-energy-pacing-resting-on-sofa.webp&w=2048) ## Quick answer An endometriosis flare-up, sometimes called an endo attack, is an episode of symptoms worse than your usual, most often pain. Flares can follow your cycle or come at random, and can last minutes, days or weeks. Heat and painkillers such as ibuprofen can help. Severe or worsening pain, fainting or heavy bleeding needs urgent care. ## Key takeaways - Endometriosis UK describes a flare-up as an episode of symptoms worse than your usual, most often pain. It can come around ovulation or your period, or at any time, and last from minutes to weeks - Possible triggers include hormone changes across the cycle, inflammation, stress and poor sleep. The causes are not fully understood, so treat any trigger as a pattern to check, not a proven cause - Heat, and NSAIDs such as ibuprofen started before pain is expected, can help. NICE suggests a short trial of paracetamol or an NSAID first, and referral if that is not enough - Call 999 or 911, or go to A&E, if pelvic pain is severe or getting worse, or comes with fainting, shoulder-tip pain, difficulty breathing or heavy bleeding - Log pain, bowel, bladder and bleeding separately, with the cycle day. NICE says a pain and symptom diary can aid discussions with your clinician ## What is an endometriosis flare-up? There is no clinical definition of an endometriosis flare. Endometriosis UK describes a flare-up, also called an endometriosis attack, as an episode of symptoms worse than usual, most often pain that is more intense than your usual pain. [\[1\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-1) So a flare is measured against your own baseline, not anyone else’s, and your baseline may not be pain-free. The symptoms are usually a louder version of the ones you already know. Endometriosis UK lists these as common during a flare: [\[1\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-1) - Intense period pain, before, during or after a period - Pelvic pain: pain or discomfort in the tummy, back and hips - Pain when peeing - Bowel symptoms: pain when pooing, bloating, diarrhoea or constipation - Pain during or after sex - Nausea, vomiting and fever The NHS also lists extreme tiredness (fatigue) as a symptom of endometriosis, along with heavy periods and low mood or anxiety. [\[3\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-3) Fatigue is easy to leave out of a pain-focused record, but on a flare day it is often what costs you the most. A high temperature with pelvic pain is a reason to contact NHS 111 or your doctor, not to wait it out. [\[6\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-6) How bad a flare feels does not tell you how much endometriosis you have. ACOG, the US college of obstetricians and gynecologists, says the amount of pain does not always match the severity of the condition: someone with slight pain can have many lesions, and someone with severe pain can have few. [\[4\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-4) Severe pain is still real, and it still deserves treatment. ## How long does an endometriosis flare last? It varies. Endometriosis UK says a flare can be a short burst lasting minutes or hours, or it can last days to weeks. Flares can also change in how often they come, how strong they are and how long they last, even for the same person. [\[1\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-1) Some flares follow a pattern. Endometriosis UK notes that flares can be cyclical, around ovulation or around your period, because endometriosis tissue tends to be more inflamed and active at those times. Others come at random. [\[1\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-1) Writing down the cycle day of each flare is the simplest way to find out which kind you have. ## What triggers endometriosis flare-ups? The causes of flares are not fully understood. Endometriosis UK describes endometriosis as an inflammatory condition and lists these possible triggers: [\[1\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-1) - Hormone changes: endometriosis depends on oestrogen, and changing oestrogen levels across the menstrual cycle can trigger symptoms - Inflammation: anything that raises inflammation in the body may set off a flare - Stress: higher stress is linked to higher pain, and it can make a flare harder to recover from - Poor sleep: lack of sleep is linked to more inflammation, and a flare can then disturb sleep further - Food, alcohol and caffeine: some foods are thought to play a part, but Endometriosis UK warns that cutting out many food groups can cause other health problems, and suggests a food and symptom diary to find your own triggers first Treat any of these as a pattern to check, not a proven cause, and do not blame yourself for a flare. A trigger becomes believable when it shows up across several flares, not after one bad week. If you want to test food, a free printable [food and symptom log](https://junocompanion.com/free-resources-and-worksheets/food-symptom-log) keeps meals and symptoms on one page. Gut symptoms need extra care, because endometriosis and irritable bowel syndrome (IBS) often overlap. A 2022 meta-analysis found the odds of IBS were about three times higher in people with endometriosis than in controls, with a pooled IBS prevalence of 23.4% among women with endometriosis. [\[8\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-8) So a bowel flare is not always endometriosis. Keep bowel symptoms in their own record, with the cycle day, so your doctor can see which ones follow your cycle. Our [IBS symptom tracker](https://junocompanion.com/chronic-illness-support/irritable-bowel-syndrome) page covers logging bowel habits, meals and stress side by side. ## What helps during an endometriosis flare? Agree a flare plan with your doctor before you need it, so a bad day is not the day for experiments. These are the options Endometriosis UK and NICE describe: - Heat: a hot water bottle, a hot bath or a heated wheat bag may help reduce pain, and being comfortable and reducing stress helps too [\[5\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-5) - NSAIDs such as ibuprofen or naproxen: Endometriosis UK says they work best started the day before, or several days before, a period or pain is expected, and taken with food or milk to reduce stomach side effects [\[5\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-5) - Paracetamol for milder pain. NICE suggests a short trial, for example 3 months, of paracetamol or an NSAID, alone or together, as the first step for endometriosis pain [\[2\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-2) [\[5\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-5) - TENS machines, which send small electrical pulses through pads on the skin. Check with your GP first, as they are not suitable if you may be pregnant or have a heart condition [\[5\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-5) - Be careful with codeine-based painkillers: they can cause constipation, which may make bowel symptoms worse [\[5\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-5) If painkillers are not giving you enough relief, NICE says your doctor should consider other pain management and referral for further assessment. NICE also says hormone treatment can reduce endometriosis pain. [\[2\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-2) Endometriosis UK lists physiotherapy and pain clinics as further options to ask your GP about. [\[5\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-5) These are conversations for your GP or gynaecologist, and a record of what you took and whether it helped makes them much quicker. ## When is a flare an emergency? Do not assume every bad episode is a flare. Some causes of pelvic pain need help straight away. ### Call 999 (UK) or 911 (US), or go to A&E, if you have pelvic pain and: - it is severe, getting worse, or hurts when you move or touch the area - you feel faint, dizzy or lightheaded, or pass out - you have pain in the tip of your shoulder - you have difficulty breathing - you have heavy bleeding from your vagina - you suddenly feel confused Contact NHS 111 or your doctor urgently if you have pelvic pain with a high temperature, blood in your pee or poo, difficulty peeing or pooing, unusual discharge or bleeding, or if you are or may be pregnant. [\[6\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-6) See a GP if your symptoms are affecting your everyday life, work or relationships, or if treatment has not helped or your symptoms are getting worse. [\[3\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-3) ## What should you log during an endometriosis flare? NICE says keeping a pain and symptom diary can aid discussions with your clinician. [\[2\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-2) The fields worth logging are the ones the guideline already looks for: pelvic pain, period pain that affects daily activities, pain during or after sex, and bowel or urinary symptoms that follow your cycle. [\[2\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-2) Keep them in separate fields rather than folding everything into one pain score. | What to note | Why it helps | | --- | --- | | Pain: where it is, what it feels like (sharp, burning, aching, cramping), when it started and how long it lasted | A 7 that kept you in bed and a 7 you pushed through at work are not the same | | What the pain stopped, delayed or changed that day | NICE asks whether period pain affects daily activities and quality of life [\[2\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-2) | | Bowel and bladder: painful poos, diarrhoea, constipation, bloating, pain when peeing or blood in your pee, each with the cycle day | Cyclical bowel and urinary symptoms are named signs of endometriosis in the NICE guideline [\[2\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-2) | | Bleeding: how often you changed your pad or tampon, clots, bleeding through, bleeding between periods | The NHS describes heavy periods as changing a pad or tampon every 1 to 2 hours, clots the size of a 10p coin or larger, or bleeding through to clothes or bedding [\[7\]](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups#source-7) | | Cycle day and period length | Shows whether your flares follow your cycle | | Fatigue, sleep and stress | Fatigue is a symptom in its own right, and poor sleep and stress are possible triggers | | What you took, when, and whether it helped | Makes the next treatment conversation quicker | On a bad day, one line per field is enough. Log close to when it happens, because details disappear when you rebuild the day from memory that evening. Record any medicine you take and how it worked, but do not use the log to experiment with treatment; that belongs with your clinician. If you prefer paper, our free printable [flare episode log](https://junocompanion.com/free-resources-and-worksheets/flare-episode-log) has the same fields, and the [sample doctor report](https://junocompanion.com/example-report) shows how weeks of entries can fit on one page. Our [symptom tracker guide](https://junocompanion.com/chronic-illness-support/tracker/symptoms) shows how the fields fit together day to day. If writing it down is the hard part, Juno can take that job. You tell her what happened by voice or text, in your own words, and she adds it to your symptom timeline. Pain, bowel, bladder and bleeding stay separate, so a cyclical pattern stays visible, and before an appointment she turns months of notes into a summary for your gynaecologist. Juno’s [endometriosis symptom tracker](https://junocompanion.com/chronic-illness-support/endometriosis) page shows how it works. ## Frequently asked questions ### How long does an endometriosis flare-up last? It varies. Endometriosis UK says a flare can last minutes or hours, or go on for days to weeks, and the same person can have both short and long flares. Some flares follow the cycle, around ovulation or a period; others come at random. Logging the cycle day of each flare shows which pattern you have. ### What does an endometriosis flare feel like? Most people describe a louder version of their usual symptoms: intense period or pelvic pain that can reach the back and hips, pain when peeing or pooing, bloating, diarrhoea or constipation, pain during or after sex, and sometimes nausea or vomiting. Fatigue is common too. A high temperature with pelvic pain needs urgent advice from NHS 111 or your doctor. ### What triggers an endometriosis flare-up? The causes are not fully understood. Endometriosis UK lists hormone changes across the cycle, inflammation, stress and poor sleep as possible triggers, and says some foods, alcohol and caffeine may play a part. Treat each as a pattern to check across several flares, not a proven cause, and do not cut out food groups without advice. ### What helps an endometriosis flare-up? Heat from a hot water bottle, bath or wheat bag may ease pain. NSAIDs such as ibuprofen work best started before pain is expected, taken with food. NICE suggests a short trial of paracetamol or an NSAID first, and referral if that is not enough. Check with your GP before using a TENS machine. ### When should I go to A&E with endometriosis pain? The NHS says call 999 or go to A&E if pelvic pain is severe, getting worse or hurts when you move or touch it, or comes with fainting or dizziness, shoulder-tip pain, difficulty breathing, heavy vaginal bleeding or sudden confusion. In the US, call 911. Contact NHS 111 for pelvic pain with a high temperature or possible pregnancy. ### Are bowel symptoms part of endometriosis or IBS? They can be either, or both. NICE lists cyclical bowel symptoms, especially painful bowel movements, as a sign of endometriosis, and a 2022 meta-analysis found the odds of IBS about three times higher in people with endometriosis. Logging bowel symptoms separately, with the cycle day, helps your doctor see which ones follow your cycle. ## Tools that go with this article - [Endometriosis symptom tracker](https://junocompanion.com/chronic-illness-support/endometriosis) - [Free flare episode log](https://junocompanion.com/free-resources-and-worksheets/flare-episode-log) - [Free food and symptom log](https://junocompanion.com/free-resources-and-worksheets/food-symptom-log) - [Sample doctor report](https://junocompanion.com/example-report) ## Sources 1. [Endometriosis UK: Endometriosis flare-ups (written for Lil-Lets)](https://www.lil-lets.com/uk/hub/endometriosis-flare-ups/) 2. [NICE NG73: Endometriosis, diagnosis and management. Recommendations](https://www.nice.org.uk/guidance/ng73/chapter/Recommendations) 3. [NHS: Endometriosis](https://www.nhs.uk/conditions/endometriosis/) 4. [ACOG: Endometriosis (patient FAQ)](https://www.acog.org/womens-health/faqs/endometriosis) 5. [Endometriosis UK: Pain relief for endometriosis](https://www.endometriosis-uk.org/pain-relief-endometriosis) 6. [NHS: Pelvic pain](https://www.nhs.uk/symptoms/pelvic-pain/) 7. [NHS: Heavy periods](https://www.nhs.uk/conditions/heavy-periods/) 8. [Nabi et al. Endometriosis and irritable bowel syndrome: a systematic review and meta-analyses. Frontiers in Medicine, 2022](https://pmc.ncbi.nlm.nih.gov/articles/PMC9357916/) ## Turn day-to-day notes into a clearer health story Juno helps you track symptoms through conversation, notice patterns, and prepare a structured summary for appointments. [Explore Juno’s endometriosis symptom tracker.](https://junocompanion.com/chronic-illness-support/endometriosis) [Download Juno on the App Store.](https://apps.apple.com/us/app/juno-chronic-illness-support/id6749455368) [Back to Flares and triggers](https://junocompanion.com/blog/flares-and-triggers) This article is for general information only and does not replace advice from your own clinician. Juno is a health assistant, not a medical provider. Last updated 15 October 2026 ## Related articles [![A woman with curly hair rests on a sofa under a knitted blanket.](https://junocompanion.com/_vercel/image?q=75&url=%2Fwebsite-assets%2Fjuno-blog-me-cfs-resting-on-sofa.webp&w=2048) ### POTS Flare-Ups: Triggers, Symptoms and How to Recover What a POTS flare up looks like, possible triggers (heat, standing, meals, periods), how to get through bad days and how to plan recovery with your clinician. ](https://junocompanion.com/blog/flares-and-triggers/pots-flare-ups)[![A smiling woman relaxes on a sofa under a blanket, holding a mug.](https://junocompanion.com/_vercel/image?q=75&url=%2Fwebsite-assets%2Fjuno-blog-fibromyalgia-blanket-sofa.webp&w=2048) ### Fibromyalgia Flare-Ups: Signs, Triggers and Recovery What a fibromyalgia flare up feels like, how long flares last, the most-reported triggers, and how to pace through one without stopping your life. ](https://junocompanion.com/blog/flares-and-triggers/fibromyalgia-flare-ups)[![A woman writes in a notebook at a table, with a straw sun hat beside her](https://junocompanion.com/_vercel/image?q=75&url=%2Fwebsite-assets%2Fjuno-blog-lupus-triggers-journal-sun-hat.webp&w=2048) ### Lupus Triggers: What Can Cause a Flare and How to Track Them Common lupus triggers, from sun and UV light to stress, infections and some medicines, and how to track them when a flare arrives days later. ](https://junocompanion.com/blog/flares-and-triggers/how-to-track-lupus-triggers) --- Source: [Endometriosis Flare-Ups: Symptoms, Triggers and What Helps](https://junocompanion.com/blog/flares-and-triggers/endometriosis-flare-ups)