Pelvic inflammatory disease, or PID, is an infection of the organs of a women’s reproductive system. It usually occurs when sexually transmitted bacteria spread from your vagina to your uterus, fallopian tubes or ovaries. They include the uterus, ovaries, fallopian tubes, and cervix. It’s usually caused by a sexually transmitted infection (STI), like chlamydia or gonorrhea, and is treated with antibiotics.

PID can cause serious problems if it’s not treated. For example, you might have trouble getting pregnant or have pain in your pelvic area that doesn’t go away.

Pelvic inflammatory disease often causes no signs or symptoms. As a result, you might not realize you have the condition and get needed treatment. The condition might be detected later if you have trouble getting pregnant or if you develop chronic pelvic pain.

Symptoms
Signs and symptoms of pelvic inflammatory disease might include:

• Pain in your lower abdomen/belly and pelvis
• Heavy discharge from your vagina with an unpleasant odor
• Abnormal uterine bleeding, especially during or after intercourse, or between menstrual cycles
• Pain or bleeding during intercourse
• Fever, sometimes with chills
• Pain when you pee or a hard time going

PID might cause only mild signs and symptoms or none at all. When severe, PID might cause fever, chills, severe lower abdominal or pelvic pain — especially during a pelvic exam — and bowel discomfort.

Causes
Many types of bacteria can cause PID, but gonorrhea or chlamydia infections are the most common. These bacteria are usually acquired during unprotected sex.

Less commonly, bacteria can enter your reproductive tract anytime the normal barrier created by the cervix is disturbed. This can happen after childbirth, miscarriage or abortion.

Risk factors
A number of factors might increase your risk of pelvic inflammatory disease, including:

• Being a sexually active woman younger than 25 years old
• Having multiple sexual partners
• Being in a sexual relationship with a person who has more than one sex partner
• Having sex without a condom
• Douching regularly, which upsets the balance of good versus harmful bacteria in the vagina and might mask symptoms
• Having a history of pelvic inflammatory disease or a sexually transmitted infection

Complications
Untreated pelvic inflammatory disease might cause scar tissue. You might also develop collections of infected fluid (abscesses) in your fallopian tubes, which could damage your reproductive organs.

Other complications might include:

• Ectopic pregnancy : PID is a major cause of tubal (ectopic) pregnancy. In an ectopic pregnancy, the scar tissue from PID prevents the fertilized egg from making its way through the fallopian tube to implant in the uterus. Ectopic pregnancies can cause massive, life-threatening bleeding and require emergency medical attention.
• Infertility : PID might damage your reproductive organs and cause infertility — the inability to become pregnant. The more times you’ve had PID, the greater your risk of infertility. Delaying treatment for PID also dramatically increases your risk of infertility.
• Chronic pelvic pain : Pelvic inflammatory disease can cause pelvic pain that might last for months or years. Scarring in your fallopian tubes and other pelvic organs can cause pain during intercourse and ovulation.
• Tubo-ovarian abscess : PID might cause an abscess — a collection of pus — to form in your uterine tube and ovaries. If left untreated, you could develop a life-threatening infection.

Prevention

To reduce your risk of pelvic inflammatory disease:

• Practice safe sex : Use condoms every time you have sex, limit your number of partners, and ask about a potential partner’s sexual history.
• Talk to your doctor about contraception : Many forms of contraception do not protect against the development of PID. Using barrier methods, such as a condom, might help to reduce your risk. Even if you take birth control pills, it’s still important to use a condom every time you have sex to protect against STIs.
• Get tested : If you’re at risk of an STI, such as chlamydia, make an appointment with your doctor for testing. Set up a regular screening schedule with your doctor if needed. Early treatment of an STI gives you the best chance of avoiding PID.
• Request that your partner be tested : If you have pelvic inflammatory disease or an STI, advise your partner to be tested and, if necessary, treated. This can prevent the spread of STIs and possible recurrence of PID.
• Don’t douche : Douching upsets the balance of bacteria in your vagina.