Pelvic inflammatory disease (PID) is an infection of the female upper genital tract, including the womb, fallopian tubes and ovaries.
PID is a common condition, although it's not clear how many women are affected in the UK. It mostly affects sexually active women aged 15 to 24.
PID often doesn't cause any obvious symptoms.
Most women have mild symptoms that may include one or more of the following:
A few women become very ill with:
It’s important to visit your GP or a sexual health clinic if you experience any of the above symptoms.
If you have severe pain, you should seek urgent medical attention from your GP or local A&E department. Delaying treatment for PID or having repeated episodes of PID can increase your risk of serious and long-term complications (see below).
There's no simple test to diagnose PID. Diagnosis is based on your symptoms and the finding of tenderness on a vaginal (internal) examination. Swabs will be taken from your vagina and cervix (neck of the womb), but negative swabs don't rule out PID.
Read more about diagnosing PID.
Most cases of PID are caused by a bacterial infection that's spread from the vagina or the cervix to the reproductive organs higher up.
In many other cases, it's caused by bacteria that normally live in the vagina.
Read more about the causes of PID.
If diagnosed at an early stage, PID can be treated with a course of antibiotics, which usually lasts for 14 days. You'll be given a mixture of antibiotics to cover the most likely infections, and often an injection as well as tablets.
It's important to complete the whole course and avoid having sexual intercourse during this time to help ensure the infection clears.
Your recent sexual partners also need to be tested and treated to stop the infection recurring or being spread to others.
Read more about treating PID.
The fallopian tubes can become scarred and narrowed if they're affected by PID. This can make it difficult for eggs to pass from the ovaries into the womb.
It's estimated that around 1 in 10 women with PID becomes infertile as a result of the condition. Women who have had delayed treatment or had repeated episodes of PID are most at risk. However, most women treated for PID are still able to get pregnant without any problems.
Read more about the complications of PID.
You can reduce your risk of PID by always using condoms with a new sexual partner until they've had a sexual health check. Chlamydia is very common in young men, and most don't have any symptoms.
If you're worried you may have an STI, visit your local genitourinary medicine (GUM) or sexual health clinic for advice. Find your local sexual health clinic.
Read more advice about STIs.