Endometriosis: Why Diagnosis Takes Years and What Helps

Your period pain is so bad that you miss school or work. Pain relievers barely help. Sex hurts, or you have pain in your pelvis on most days. You may have been told for years that painful periods are normal. They are not, and you deserve answers.

This guide explains endometriosis, why diagnosis often takes so long, how it is diagnosed today, and what treatments can help.

What endometriosis is

Endometriosis is a chronic condition where tissue similar to the lining of the uterus grows outside the uterus. It is often found on the ovaries, the outside of the uterus, the tissue lining the pelvis, and sometimes the bowel or bladder.[1]

This tissue responds to hormones. It causes inflammation, pain, and scar tissue. The WHO estimates that endometriosis affects about 10% of women and girls of reproductive age, or about 190 million people worldwide.[1]

Common symptoms include:[1][5]

• Severe pain during periods.
• Pelvic pain between periods.
• Pain during or after sex.
• Pain with bowel movements or urination, especially during periods.
• Heavy periods.
• Tiredness, bloating, and nausea.
• Trouble getting pregnant.

The amount of disease does not always match the amount of pain. Some people with small spots have severe pain. Others with larger disease have few symptoms.

Why diagnosis takes years

The WHO notes that long delays in diagnosis are common.[1] Studies often report delays of several years between first symptoms and diagnosis. Reasons include:

• Period pain is often treated as normal, by patients, families, and clinicians.
• Symptoms overlap with other conditions, such as irritable bowel syndrome and bladder pain.
• In the past, diagnosis required surgery, which many people waited for.
• Hormonal birth control can hide symptoms for years.

The Canadian guideline says that education for the public and for health care providers is essential to reduce these delays.[3]

What your doctor looks at

A careful history and exam

Clinicians ask about the timing and severity of your pain, how it affects school, work, and sex, bowel and bladder symptoms, and fertility. A pelvic exam can find tenderness or nodules, but a normal exam does not rule it out.[2][4]

Imaging

The European Society of Human Reproduction and Embryology (ESHRE) 2022 guideline changed a major rule. It recommends ultrasound or MRI as the first diagnostic tests. Surgery is no longer the required "gold standard" for diagnosis.[2]

• A transvaginal ultrasound (a probe placed in the vagina) can find endometriomas (ovarian cysts from endometriosis) and deep disease, especially when done by an experienced sonographer.
• MRI can help map deep disease before surgery.
• A negative scan does not rule out endometriosis, because small surface spots are often missed.[2]

The 2024 Canadian guideline from the Society of Obstetricians and Gynaecologists of Canada (SOGC) agrees. Surgery with a tissue sample confirms the diagnosis, but it is not needed when imaging has already confirmed it.[3] The UK NICE guideline also supports ultrasound early and referral when symptoms persist.[4]

Treatment without a surgical diagnosis

ESHRE says clinicians can start treatment based on symptoms, without waiting for surgery or imaging proof.[2] This is called empirical treatment. It lets many people get relief sooner.

What helps

Treatment depends on your main goal: less pain, pregnancy, or both.

For pain

• NSAIDs, such as ibuprofen or naproxen, for period pain.[2]
• Combined hormonal birth control, such as the pill, patch, or ring, often taken without breaks to stop periods.[2]
• Progestin-only options, such as dienogest, norethindrone, the hormonal IUD, or the implant.
• GnRH agonists or antagonists, which lower estrogen. They are often used as second-line treatment and may be combined with "add-back" hormones to protect bones.[2]
• Pelvic floor physiotherapy, pain programs, and mental health support for long-term pain.

Hormonal treatments control symptoms but do not cure the disease. Pain often returns when they stop.

Surgery

Laparoscopy (keyhole surgery) can remove or destroy endometriosis and cysts. It can reduce pain, but symptoms come back for some people.[2] Surgery for deep disease on the bowel or bladder should be done in centers with special experience. A hysterectomy is an option for some people who do not want future pregnancy, but it does not always end pain.

For fertility

Options include surgery in some cases and assisted reproduction, such as IVF.[2] A fertility specialist can help weigh them.

Endometriosis in teens

Endometriosis can start in the teen years. The ESHRE guideline covers adolescents and advises clinicians to take severe period pain in teens seriously.[2] Teens who miss school because of period pain, or whose pain does not respond to pain relievers and hormonal treatment, should be assessed. Early care can help with school, sports, and mental health.

Questions to ask your clinician

• Could my symptoms be endometriosis?
• Can I have a transvaginal ultrasound with someone experienced in endometriosis?
• Can we start treatment now, before a definite diagnosis?
• Which hormonal option fits my goals and side effect concerns?
• When would surgery make sense, and who should do it?
• How does this affect my plans for pregnancy?
• Can I see a pelvic floor physiotherapist or pain specialist?

When to get care quickly

Go to the emergency department if you have sudden severe pelvic pain, especially with fever, vomiting, fainting, or a positive pregnancy test. These can be signs of a twisted or burst ovarian cyst, infection, or an ectopic pregnancy. Call 911 if you faint or have heavy bleeding with dizziness.

Bottom line

Endometriosis is common, and severe period pain is not something you have to accept. Diagnosis no longer always requires surgery: ultrasound or MRI can confirm many cases, and treatment can start based on symptoms. Pain relievers, hormonal medicines, surgery, and fertility care can all help, depending on your goals.

Primary AI can show you the guideline and study sources behind this topic in plain language, so you can bring better questions to your appointment.