Painful periods are common, but severe menstrual cramps should not be dismissed as something every woman has to tolerate. Some women experience mild discomfort during menstruation, while others have pain that affects sleep, work, exercise and everyday activities. The cause may be normal womb contractions, but persistent or worsening pain can also point to an underlying gynaecological condition.
Understanding the possible causes can help you recognise when to seek medical advice and what treatment options may be available.
What Are Painful Periods and Why Do They Happen?
Painful periods, medically known as dysmenorrhoea, are cramps or discomfort experienced shortly before or during menstrual bleeding. They usually affect the lower abdomen but can also spread to the lower back and thighs.
The main cause of ordinary menstrual cramps is the release of chemicals called prostaglandins. These chemicals make the womb contract to help shed its lining. Higher levels can lead to stronger contractions and more intense pain.
Common symptoms include:
- Cramping or tightening in the lower abdomen
- Pain in the lower back or thighs
- Nausea or vomiting
- Diarrhoea
- Headaches
- Tiredness or dizziness
The discomfort often starts just before or when bleeding begins and may last for a few days.
How Common Is Period Pain? What Do the Statistics Show?
Period pain affects a large proportion of women, but the severity and impact can vary.
A UK survey commissioned by Wellbeing of Women in 2023 found that:
- 96% of women and girls aged 16–40 surveyed had experienced period pain.
- 51% said they experienced it every period.
- Among those who had experienced period pain, 62% described it as severe and 24% as very severe.
A separate England survey by the Reproductive Health Survey for England found that around one in three participants aged 16–24 reported severely painful periods in the previous year.
These figures show why menstrual pain deserves attention. However, survey results are not a diagnosis and do not mean that every woman with cramps has a medical condition.
What Are the 10 Possible Causes of Painful Periods?
The causes can be divided into two broad groups: primary dysmenorrhoea, where there is no underlying pelvic condition, and secondary dysmenorrhoea, where another condition may be responsible.
| Possible cause | Common symptoms or clues |
|---|---|
| Primary dysmenorrhoea | Cramps around the start of menstruation |
| Endometriosis | Severe period pain, pelvic pain, pain during sex |
| Adenomyosis | Painful and often heavy periods |
| Uterine fibroids | Heavy bleeding, cramps and pelvic pressure |
| Pelvic inflammatory disease | Pelvic pain, unusual discharge and fever |
| Ovarian cysts | One-sided pelvic pain or pressure |
| Copper IUD | Increased cramps or heavier periods after fitting |
| Pelvic or urinary infection | Pain with urinary symptoms or unusual discharge |
| Cervical stenosis | Possible obstruction to menstrual flow |
| Reproductive tract differences | Severe or recurring pain, sometimes from the first periods |
1. Could Primary Dysmenorrhoea Be Causing Your Cramps?
Primary dysmenorrhoea is menstrual pain that is not caused by an underlying pelvic condition. It is commonly linked to prostaglandins, which cause the womb to contract during menstruation.
You may notice:
- Cramping shortly before or during your period
- Pain in the lower abdomen
- Discomfort spreading to the back or thighs
- Symptoms that last for a few days
It often starts during the teenage years. However, if the pain becomes severe, changes over time or affects daily activities, a medical assessment is sensible.
2. Can Endometriosis Cause Severe Period Pain?
Yes. Endometriosis can cause severe menstrual pain, pelvic pain and discomfort during sex. It develops when tissue similar to the lining of the womb grows outside the womb, often around the ovaries and other pelvic structures.
Other possible symptoms include:
- Pain when opening your bowels, particularly during periods
- Pain when passing urine around menstruation
- Persistent pelvic pain
- Difficulty becoming pregnant in some cases
Pain that affects everyday activities is an important symptom. NICE recommends considering endometriosis when period-related pain affects daily life or quality of life.
A normal ultrasound scan does not always rule out endometriosis, so further assessment may still be needed.
3. Does Adenomyosis Make Periods More Painful?
Adenomyosis occurs when tissue similar to the lining of the womb grows into the muscle wall of the womb. It can cause painful periods, heavy bleeding and pelvic discomfort.
Possible symptoms include:
- Severe menstrual cramps
- Heavy or prolonged bleeding
- Pelvic pressure or tenderness
- Pain during or after sex
Some women have no noticeable symptoms. If your periods have become increasingly painful or heavy, a gynaecologist may recommend an examination or ultrasound scan to investigate the cause.
4. Can Uterine Fibroids Cause Menstrual Cramps?
Yes. Uterine fibroids are non-cancerous growths that develop in or around the womb. Depending on their size, number and position, they may contribute to heavy bleeding, cramps and pelvic pressure.
Other symptoms can include:
- Lower back pain
- Frequent urination
- Abdominal swelling or bloating
- Discomfort during sex
- A feeling of fullness in the lower abdomen
Not every fibroid causes symptoms. An ultrasound scan can help identify fibroids and assess their size and position.
5. Could Pelvic Inflammatory Disease Be the Reason?
Pelvic inflammatory disease (PID) is an infection affecting the reproductive organs, including the womb, fallopian tubes and ovaries. It can cause pelvic pain that may become worse around menstruation.
Look out for other symptoms:
- Unusual vaginal discharge
- Pain during sex
- Bleeding between periods
- Bleeding after sex
- Fever or feeling unwell
PID needs medical assessment and usually antibiotic treatment. Early treatment is important because untreated infection can lead to complications, including fertility problems.
6. Can Ovarian Cysts Cause Period-Related Pain?
Ovarian cysts are fluid-filled sacs that develop on or inside an ovary. Many are harmless and disappear without treatment, but some can cause pelvic pain or pressure.
You may experience:
- Pain on one side of the lower abdomen
- Bloating or abdominal discomfort
- Pain during sex
- Pelvic pain that comes and goes
Not all ovarian cysts cause menstrual pain. Sudden, severe pelvic pain, especially with nausea or vomiting, needs urgent medical assessment because it may indicate a complication such as ovarian torsion or a ruptured cyst.
7. Can a Copper IUD Make Your Periods More Painful?
Yes. A copper intrauterine device (IUD), also known as a copper coil, can make periods heavier or more painful, particularly during the first few months after fitting.
Some women experience:
- Stronger menstrual cramps
- Heavier bleeding
- Longer periods
- Cramping after the device is fitted
If the pain is severe, persistent or getting worse, contact your healthcare professional. Fever, unusual discharge or significant pelvic pain should be assessed promptly.
8. Could a Pelvic or Urinary Infection Be Causing the Pain?
Yes. Infections affecting the urinary or reproductive system can cause lower abdominal discomfort that may be mistaken for menstrual cramps.
Possible clues include:
- Burning or pain when passing urine
- Needing to urinate more often
- Unusual vaginal discharge
- Fever or chills
- Pelvic discomfort outside your period
The treatment depends on the type of infection. A clinician may recommend urine tests, swabs or other investigations.
9. Can Cervical Stenosis Affect Menstrual Flow?
Cervical stenosis occurs when the opening of the cervix becomes narrower than usual. In some cases, this can restrict the flow of menstrual blood and contribute to pelvic pain.
It is an uncommon cause and may be associated with previous cervical procedures, surgery or changes after menopause.
A gynaecologist can assess whether cervical narrowing or another condition is responsible for the symptoms.
10. Can Differences in the Reproductive Tract Cause Severe Cramps?
Yes. Some women are born with structural differences in the reproductive tract. Certain differences can obstruct the normal flow of menstrual blood and lead to recurring pelvic pain.
Possible signs include:
- Severe cramps from the first periods
- Repeated pelvic pain
- Difficulty with menstrual flow
- Pain that does not improve with usual treatment
These conditions are uncommon, but a specialist may investigate them when symptoms are severe or begin soon after periods start.
When Should You Worry About Period Pain?
You should speak to a GP or gynaecologist if your pain is severe, getting worse or affecting your everyday activities. You do not need to wait until the pain becomes unbearable.
Arrange a medical appointment if:
- Your periods have become more painful over time.
- Pain stops you going to work or carrying out normal activities.
- Usual pain relief does not help.
- You experience pain during or after sex.
- You have pain when passing urine or opening your bowels.
- Your bleeding is unusually heavy or irregular.
- You experience bleeding between periods or after sex.
- You have persistent pelvic pain outside menstruation.
When is urgent help needed? If pelvic pain is severe or worse than usual and painkillers have not helped, contact NHS 111 or seek an urgent GP appointment. Sudden severe pain, fainting or heavy bleeding with possible pregnancy needs urgent assessment. Call 999 for a life-threatening emergency.
How Do Doctors Diagnose the Cause of Period Pain?
A gynaecologist usually starts by discussing your symptoms, menstrual history and medical background. Further tests depend on what your symptoms suggest.
Your consultation may include:
1. Medical and menstrual history: Your doctor may ask when the pain started, how severe it is, whether it is getting worse and whether you have other symptoms.
2. Pelvic examination: An examination may be recommended to check for tenderness, swelling or other signs. It should only happen with your informed consent.
3. Ultrasound scan: An ultrasound can help assess the womb and ovaries and identify conditions such as fibroids, ovarian cysts and some signs of adenomyosis or endometriosis.
4. Blood, urine or swab tests: These may be recommended if your symptoms suggest infection, anaemia or another condition.
A normal scan does not rule out every cause of pelvic pain. NICE advises that suspected endometriosis should still be considered when an ultrasound or examination is normal.
What Treatments Can Help with Painful Periods?
Treatment depends on the cause, severity of symptoms, medical history and pregnancy plans. Options may include:
- Anti-inflammatory medicines: Medicines such as ibuprofen can help reduce menstrual cramps. They are not suitable for everyone, so check with a pharmacist or clinician.
- Heat therapy: A warm bath or a heat pad wrapped in a towel may ease discomfort.
- Gentle activity: Walking and stretching may help some women manage cramps.
- Hormonal treatment: Certain contraceptive pills, progestogen treatments or hormonal coils may reduce bleeding and pain.
- Condition-specific treatment: Endometriosis, adenomyosis, fibroids and infections may need additional medical or surgical treatment.
Your gynaecologist can explain the benefits, possible risks and alternatives before you decide on a treatment plan.
What Should You Track Before Seeing a Gynaecologist?
Keeping a menstrual and symptom diary can help your doctor understand what you are experiencing.
Record the following for a few cycles:
- The first and last day of your period
- When the pain starts and how long it lasts
- Where you feel the pain
- How severe the pain is
- How heavy your bleeding is
- Any pain during sex, urination or bowel movements
- Which medicines you take and whether they help
This information can support a more focused consultation and help guide decisions about further investigations.
Frequently Asked Questions About Painful Periods
1. Why are my period cramps so painful?
Strong cramps can happen because prostaglandins make the womb contract. However, severe or worsening pain may also be linked to endometriosis, adenomyosis, fibroids or another pelvic condition.
2. Are painful periods normal every month?
Some discomfort is common during menstruation. However, pain that regularly affects your work, sleep or daily activities should be assessed rather than dismissed as normal.
3. Can painful periods be a sign of endometriosis?
Yes. Severe period pain, pelvic pain, pain during sex and pain when opening your bowels around menstruation can be associated with endometriosis. A medical assessment can help investigate the cause.
4. Why have my periods suddenly become more painful?
New or worsening cramps can be associated with endometriosis, adenomyosis, fibroids, pelvic infection or an IUD. A GP or gynaecologist can assess the symptoms and recommend suitable investigations.
5. Can fibroids cause severe period pain?
Fibroids can contribute to painful or heavy periods, depending on their size and position. They may also cause pelvic pressure, lower back pain and frequent urination.
6. Can period pain affect fertility?
Period pain alone does not mean you will have fertility problems. However, some underlying conditions, including endometriosis and pelvic inflammatory disease, can affect fertility.
7. What is the difference between normal cramps and severe period pain?
Ordinary cramps are often manageable and last a few days. Pain that stops normal activities, becomes progressively worse or does not respond to usual treatment needs medical assessment.
8. When should I see a gynaecologist about period pain?
Seek an assessment if pain is severe, persistent, worsening or affecting everyday life. Also discuss heavy bleeding, irregular periods, pain during sex or ongoing pelvic discomfort.
Get the Right Support for Menstrual Pain
Menstrual cramps are common, but severe or worsening pain should not be something you simply learn to live with. The cause may be ordinary womb contractions, but conditions such as endometriosis, adenomyosis, fibroids and pelvic infections may also need investigation.
If your symptoms are affecting your quality of life, arrange an appointment with a GP or gynaecologist. Finding the cause can help you understand your treatment options and make informed decisions about your health.
Medical disclaimer: This article provides general health information and does not replace an individual medical consultation, diagnosis or treatment advice.