Painful Periods (Period Cramps): Causes and Relief

What causes period pain

During a period, the uterine lining releases prostaglandins, chemicals that make the uterine muscle contract to shed the lining. Higher levels cause stronger contractions that briefly cut blood flow to the muscle, which causes cramping pain. Prostaglandins can also cause nausea, loose stools, headaches and dizziness during periods.

Primary dysmenorrhea

This is common period pain without an underlying disease. It usually begins within a few years of the first period, once ovulation is regular, and is most intense in the teens and early twenties. Pain starts a few hours before or at the start of bleeding, peaks in the first 24 to 36 hours and fades within 2 to 3 days.

Secondary dysmenorrhea

Period pain caused by a condition of the pelvic organs:

When is period pain not normal?

Period pain is common, affecting more than half of people who menstruate, and severe in some. But severe pain is not something to just put up with. See a doctor if:

• pain makes you miss school, work or social activities
• NSAIDs taken correctly do not control it
• pain started after age 25, or is getting worse over time
• you have pain during sex, pain with bowel movements or pelvic pain outside periods
• periods are very heavy or irregular

Endometriosis takes an average of several years to diagnose, often because pain is dismissed as normal. Teenagers with severe pain unresponsive to treatment should be evaluated for it.

How doctors find the cause

A doctor will ask about the timing and severity of pain, how it affects daily life, bleeding pattern, sexual history, pain during sex or bowel movements, and contraception. Depending on age and symptoms:

• pelvic exam to look for tenderness, masses or signs of infection (not always needed in young teens with typical primary dysmenorrhea)
• STI tests if infection is possible
• pregnancy test
• pelvic ultrasound for fibroids, adenomyosis and ovarian cysts or endometriomas
• MRI in some cases
• laparoscopy: keyhole surgery to see and treat endometriosis, used when symptoms persist despite treatment

Period pain relief

Medicines

• NSAIDs such as ibuprofen or naproxen block prostaglandin production and are the most effective over-the-counter option. Start at the first sign of your period or pain, or even the day before if periods are predictable, and take regularly for 1 to 3 days. Follow the label dose. Avoid them if you have stomach ulcers, kidney disease, aspirin-sensitive asthma or are pregnant.
• Acetaminophen (paracetamol) helps less but can be combined with an NSAID if needed.
• Hormonal contraception: combined pills, patch or ring (especially taken continuously to skip periods), the hormonal IUD, implant or injection reduce or stop period pain for most people.

Self-care

• Heat: a heating pad or hot water bottle on the lower belly works about as well as NSAIDs for some people.
• Exercise: regular aerobic exercise reduces period pain over time.
• TENS: a small device that sends mild electric pulses through skin pads can relieve cramps.
• Rest and gentle stretching, such as knees-to-chest or child's pose.
• Stop smoking, which is linked to worse period pain.

Some studies support ginger, vitamin B1 and omega-3 supplements, but evidence is limited.

Treating secondary causes

Endometriosis is treated with hormonal therapy, pain management and sometimes surgery to remove lesions. Adenomyosis and fibroids may be treated with hormonal treatment, a hormonal IUD, procedures or surgery. Infections need antibiotics.

Frequently asked questions

What helps period cramps fast?

Taking ibuprofen or naproxen at the first sign of pain, following the label, and applying heat to the lower belly are the fastest, most effective steps. Gentle movement and stretching can help. If you know when your period is due, starting NSAIDs a day early works even better.

How do I know if period pain is endometriosis?

Endometriosis is more likely if pain is severe, worsens over time, doesn't respond to NSAIDs, or comes with pain during sex, painful bowel movements, pelvic pain between periods or difficulty getting pregnant. Only a doctor can assess this, sometimes with imaging or laparoscopy.

Why are my periods suddenly more painful?

New or worsening pain can come from adenomyosis, fibroids, endometriosis, an ovarian cyst, pelvic infection or a copper IUD. Sudden severe pain, especially one-sided or with a positive pregnancy test, needs urgent care. Gradual worsening should be checked by a doctor.

Do periods get less painful with age?

Primary period pain often lessens with age and after childbirth. Pain that increases with age is more typical of secondary causes such as adenomyosis or endometriosis and is worth investigating.

Can birth control help painful periods?

Yes. Hormonal contraception, including pills, the patch, the ring, the hormonal IUD, the implant and the injection, reduces or stops period pain in most people. Taking combined pills continuously to skip periods is especially effective.