Pelvic inflammatory disease (PID) is a serious complication of some STIs. It is a general name for infections of the uterus, ovaries, and fallopian tubes. PID is common. Women can get PID if they have an STI (like untreated chlamydia or gonorrhea). It can cause infertility in women.

Risks

• you are at risk if you are a person with female reproductive organs and have an untreated STI (like chlamydia or gonorrhea)

Symptoms

• pain in your lower abdomen
• fever
• unusual discharge with a bad odor from your vagina
• pain and/or bleeding when you have sex
• burning sensation when you urinate
• bleeding between periods

Testing

• depending on the cause of the PID, testing may include a physical examination of your pelvic area to check for tenderness and swelling, blood tests, urine test, swabs of the vagina and cervix, ultrasound (pelvic or transvaginal), and/or laparoscopy

Treatment

• if diagnosed early, treated and cured with antibiotics
• treatment won’t undo any damage that has already happened to your reproductive system; get diagnosed and treated as soon as possible
• left untreated, it can cause permanent damage in women, making it difficult or impossible to get pregnant later

Source and more info: CDC – PID