Endometriosis symptoms centre on pelvic pain that is worse around your period, but the condition reaches well beyond that: fatigue that sleep does not fix, painful sex, cyclical bowel and bladder symptoms and lower back or leg pain. It affects around 1 in 10 women of reproductive age in the UK. The average time from first symptom to diagnosis is 7 to 8 years. A normal ultrasound does not rule it out, which is one of the main reasons that delay exists.
If you are here because your periods are worse than everyone else seems to think is normal, that instinct is worth taking seriously. Pain severe enough to stop you working is not something to manage quietly for another 5 years.
This guide covers what endometriosis symptoms actually feel like day to day, which ones get overlooked and what a proper assessment involves.
What does endometriosis pain feel like?
The most common description is a deep, dragging or grinding ache low in the pelvis that builds in the days before a period and peaks during it. Some women describe it as stabbing or burning instead. It is usually distinct from ordinary period cramping in three ways: it starts earlier, it lasts longer and standard painkillers barely touch it.
The pain is not always central. It can sit to one side, spread into the thighs and hips or settle in the lower back. Some women feel it most on opening their bowels during a period.
The other thing women describe and it rarely makes the textbook lists, is that the pain is exhausting rather than just sore. Chronic pelvic pain wears people down. Poor sleep, cancelled plans and constantly working out whether you can commit to something three weeks away all take a toll that is separate from the pain itself.
Pain that does not respond to painkillers
This is clinically significant and worth saying explicitly at your appointment. If ibuprofen and paracetamol at proper doses make little difference to your period pain, that is a finding, not a failure to take enough of them. Ordinary primary dysmenorrhoea usually responds well to anti-inflammatories. Pain that does not is a reason to look further.
What are the most common symptoms?
Cyclical and chronic pelvic pain
Pain that intensifies before and during menstruation is the defining feature. Many women also have a background ache throughout the month that flares unpredictably, which is the pattern most often mistaken for something else.
Heavy or irregular periods
Heavy menstrual bleeding is common alongside endometriosis. Soaking through protection quickly, passing clots or bleeding for longer than 7 days all count. Spotting between periods can also occur.
Heavy periods have several possible causes and endometriosis is only one of them. Fibroids, polyps and adenomyosis all present the same way, which is why heavy menstrual bleeding is investigated on its own merits rather than assumed to be part of the endometriosis picture.
Painful sex
Deep pain during or after penetration is common and consistently underreported. It happens when deposits sit on the uterosacral ligaments, the space behind the uterus or the ovaries. The pain is typically deep rather than at the entrance, worse in some positions and can last for hours afterwards.
Very few women raise this without being asked directly. It matters diagnostically so it is worth saying out loud even if the consultation has not gone anywhere near it.
Which symptoms get missed?
Bowel and bladder symptoms
- Painful bowel movements, worst during a period
- Constipation or diarrhoea that follows a cyclical pattern
- Severe, sudden bloating, often called endo belly
- Urinary urgency or frequency around menstruation
- Pain passing urine
- Rectal bleeding during periods, where the bowel is involved
These are routinely put down to irritable bowel syndrome or recurrent urine infections. The distinguishing feature is the timing. IBS does not track your menstrual cycle. If your gut or bladder symptoms reliably worsen with your period, that pattern belongs in front of a gynaecologist.
Fatigue
Not ordinary tiredness. Women describe an exhaustion that sleep does not resolve, worst around menstruation, that limits what they can do. It is thought to reflect chronic inflammation, disrupted sleep from pain and the sheer effort of managing a long-term condition. It is one of the symptoms that most affects quality of life and one of the least often asked about.
Lower back and leg pain
Deposits on the uterosacral ligaments or near the sciatic nerve refer pain into the lower back, buttocks and down one leg. When it is cyclical, it is far more likely to be gynaecological than musculoskeletal, however much it feels like sciatica.
Shoulder tip pain at the start of a period
Uncommon but distinctive. Right-sided shoulder or chest pain that arrives with a period can indicate diaphragmatic endometriosis, where deposits irritate the phrenic nerve. If it has no other explanation and it is cyclical, mention it.
Call 999 or go to A&E if you have sudden severe pelvic pain, particularly with vomiting, faintness or shoulder tip pain that comes on abruptly. A ruptured ovarian cyst, a torted ovary or an ectopic pregnancy can all present this way and all need assessing on the day.
Seek same-week advice for new bleeding between periods, bleeding after sex or pelvic pain that is a clear change from your usual pattern.
How symptoms change through the cycle
Endometriosis responds to oestrogen, which is why symptoms follow the cycle rather than sitting flat across the month.
| Point in the cycle | Typical pattern |
|---|---|
| Days before your period | Pelvic pain building, bloating, fatigue increasing, mood changes |
| During your period | Pain at its worst, heaviest bleeding, bowel and bladder symptoms most pronounced |
| Just after | Gradual easing, though background pain often persists |
| Ovulation | A secondary pain spike in some women |
| Between periods | Background ache, fatigue and painful sex can continue throughout |
Not everyone fits this. Some women have continuous pain with no cyclical pattern at all, particularly where there is deep infiltrating disease or where pain has become established over years.
Is this endometriosis or normal period pain?
The normalisation of period pain is the single biggest driver of the 7 to 8 year diagnostic delay, so this distinction is worth setting out plainly.
| Ordinary period pain | Endometriosis pain | |
|---|---|---|
| When it starts | With the bleeding | Days before |
| How long | Eases within 1-3 days | Continues after bleeding stops |
| Painkillers | Usually effective | Often inadequate |
| Other symptoms | Few | Fatigue, painful sex, bowel or bladder symptoms |
| Over time | Stable or improves after childbirth | Often progressive |
| Effect on life | Inconvenient | Regularly stops normal activity |
The practical test most clinicians use: if your period pain regularly makes you miss work, school or plans, it is not ordinary period pain and it warrants investigation.
Does symptom severity match the stage?
No and this surprises almost everyone. Endometriosis is staged I to IV based on how much disease is present and where. Stage does not predict how much pain you will have.
Women with stage I disease, meaning a few superficial deposits, can be in debilitating pain. Women with stage IV disease and extensive adhesions can have very few symptoms and be diagnosed incidentally during fertility investigations. The staging system describes the anatomy. It does not describe the suffering and it should never be used to decide whether your pain is proportionate.
What does track more closely with pain is the depth of the deposits and their position, particularly whether they involve the nerve-rich tissue behind the uterus.
Can endometriosis affect fertility?
Around 30 to 40% of women with endometriosis experience difficulty conceiving. The mechanisms include distorted pelvic anatomy, blocked or damaged fallopian tubes, inflammation affecting egg and sperm and endometriomas reducing ovarian reserve.
The other side of that figure matters just as much. The majority of women with endometriosis conceive, many without any assistance. A diagnosis of endometriosis is not a diagnosis of infertility and it is worth saying that clearly because a lot of women leave their diagnosis appointment believing otherwise.
If you have endometriosis and are planning a pregnancy, earlier specialist input is sensible, so that the sequence of any surgery and any fertility treatment can be planned together rather than one after the other. We cover this in more depth in our post on supporting fertility and pregnancy in women with endometriosis.
How is endometriosis diagnosed?
Diagnosis starts with the history, which does more work here than any test. A clinician who takes a careful account of the timing, character and impact of your symptoms will usually have a strong idea before any imaging.
Examination and ultrasound
A pelvic examination can identify tenderness behind the uterus, nodules on the uterosacral ligaments and a uterus that is fixed rather than mobile. A transvaginal ultrasound detects endometriomas on the ovaries reliably and can suggest deep infiltrating disease in experienced hands.
What it cannot do is detect superficial deposits, which is where a great many women are told everything looks normal. If you have had a scan reported as clear and your symptoms are continuing, that is a reason to go further, not a reason to stop. Our guide to what a thorough pelvic ultrasound should involve is worth reading before your next scan.
MRI
MRI is used where deep infiltrating endometriosis involving the bowel, bladder or ureters is suspected. It maps the disease before surgery, so that the right surgical team is in the room.
Laparoscopy
Laparoscopy remains the definitive test. Under general anaesthetic, a camera is passed through a small incision at the navel and the pelvis is inspected directly. Deposits can be seen, biopsied and, in the same operation, treated by excision or ablation.
NICE guidance is explicit that a normal scan or examination does not exclude endometriosis and that treatment can be started on the basis of symptoms without waiting for surgical confirmation. Nobody should be left in pain for years purely because they are waiting for a laparoscopy.
Ovara offers assessment and endometriosis treatment at our Chelsea clinic, including a one-stop model where examination and ultrasound happen in the same visit as the consultation. Our post on one-stop endometriosis diagnosis at the first clinic visit explains how that appointment runs.
Why it takes so long
Four things drive the 7 to 8 year delay: period pain is normalised from adolescence onwards, the symptoms overlap almost entirely with IBS and bladder conditions, there is no blood test and a normal scan is frequently treated as an all-clear. We have looked at this in detail in why it takes so long to diagnose endometriosis.
What to track before your appointment
A symptom diary kept over 2 or 3 cycles changes an appointment completely. It converts a vague account into a pattern and the pattern is the diagnostic information. Record:
- Period dates and how heavy the flow is
- A daily pain score out of 10 and where the pain is
- Bowel and bladder symptoms and whether they follow the cycle
- Whether sex is painful and where in the cycle
- Fatigue levels
- Days when symptoms stopped you doing something you had planned
- What painkillers you took and whether they worked
That last line is more useful than most people expect. A record of anti-inflammatories at proper doses failing to control the pain carries real weight.
When should you see a specialist?
Consider a gynaecology assessment if any of these apply:
- Your periods regularly stop you working or doing normal activities
- Painkillers are not controlling the pain
- Sex has been painful for more than a few months
- Your bowel or bladder symptoms track your cycle
- You have been trying to conceive for 6-12 months without success
- You have been told your scan is normal but the symptoms continue
You do not need to have exhausted every option first and you do not need to wait until it is unbearable.
Sources and further reading
- NICE - Endometriosis: diagnosis and management (NG73)
- NHS - Endometriosis
- Royal College of Obstetricians and Gynaecologists - Endometriosis patient information
- Endometriosis UK - Symptoms and support
Our consultant gynaecologists assess suspected endometriosis at our Chelsea clinic, with pelvic ultrasound available in the same appointment. Most patients are seen within days. New consultation £300, combined consultation and scan £475.
Major private medical insurers accepted - please contact us to confirm your provider.
Frequently Asked Questions
What does endometriosis pain feel like?
Most women describe a deep, dragging or grinding ache low in the pelvis that builds in the days before a period and peaks during it. It can spread into the lower back, hips and thighs and it often responds poorly to ordinary painkillers. Some describe it as stabbing or burning instead.
How is endometriosis pain different from normal period pain?
Endometriosis pain usually starts days before bleeding, continues after it stops, responds poorly to painkillers and comes with other symptoms such as fatigue, painful sex or cyclical bowel and bladder problems. Ordinary period pain starts with the bleeding and settles within a couple of days.
Does a normal ultrasound rule out endometriosis?
No. A pelvic ultrasound reliably detects endometriomas on the ovaries and can suggest deep disease, but it cannot see superficial deposits. A normal scan does not exclude endometriosis and NICE guidance says so explicitly.
Can you have endometriosis without pain?
Yes, though it is uncommon. Some women are diagnosed incidentally during fertility investigations or surgery for another reason. Pain remains the most common presenting symptom.
Can endometriosis cause back pain?
Yes. Deposits on the uterosacral ligaments or near the sciatic nerve refer pain into the lower back, buttocks and down one leg. Because it is cyclical, it is often misattributed to a musculoskeletal problem.
Does endometriosis cause fatigue?
Yes. Fatigue is a recognised and significantly underreported symptom, described by many women as far worse than ordinary tiredness. It is thought to reflect chronic inflammation, disrupted sleep from pain and the demands of managing a long-term condition.
Can endometriosis affect the bowel?
Yes. Deposits on or near the bowel cause painful bowel movements around menstruation, cyclical constipation or diarrhoea, severe bloating and occasionally rectal bleeding during periods. The cyclical timing is what distinguishes it from irritable bowel syndrome.
Can endometriosis affect the bladder?
Yes. Bladder involvement causes urgency, frequency and pain passing urine, typically worse around a period. Repeated urine infection symptoms that do not respond to antibiotics are worth investigating gynaecologically.
Does the stage of endometriosis predict how bad the symptoms are?
No. Women with stage I disease can have severe pain and women with stage IV disease can have almost none. The staging system describes how much disease is present and where, not how much it hurts.
How is endometriosis diagnosed?
Through history, pelvic examination, transvaginal ultrasound and, where deep disease is suspected, MRI. Laparoscopy remains the definitive test because it allows the deposits to be seen directly and treated in the same operation. Treatment can be started on symptoms alone without waiting for surgery.
What happens during a laparoscopy for endometriosis?
Under general anaesthetic, a camera is passed through a small incision at the navel and the pelvis is inspected directly. Deposits can be biopsied and treated by excision or ablation in the same procedure. It is usually a day case, with most women back to normal activity within one to two weeks.
Can endometriosis affect fertility?
Around 30 to 40% of women with endometriosis have difficulty conceiving, but the majority do conceive, many without assistance. A diagnosis of endometriosis is not a diagnosis of infertility. If you are planning a pregnancy, earlier specialist input helps sequence any surgery and fertility treatment sensibly.
What treatments are available for endometriosis?
Hormonal treatment such as the combined pill, progestogens, a hormonal coil or GnRH analogues, pain management and surgical excision or ablation at laparoscopy. Which is right depends on where the disease is, how severe the symptoms are and whether you are planning a pregnancy.
How do I see an endometriosis specialist in London?
At Ovara Health in Chelsea you can book a consultant gynaecology appointment directly without a GP referral, usually within days. Consultation with pelvic ultrasound in the same visit is £475 or £300 for consultation alone.
By Kerry Archer
Medically reviewed by Mr Amer Raza, MBBS MRCOG, GMC 5205372, Consultant Gynaecologist and Medical Director, Ovara Health - September 2026
Book an Endometriosis Assessment in London
Our consultant gynaecologists assess suspected endometriosis at our Chelsea clinic, with pelvic ultrasound available in the same appointment, so that you leave with a plan. Most patients are seen within days. Major private insurance policies are accepted and no GP referral is needed.
