What it means
PID is an infection of the uterus, fallopian tubes and ovaries. It is transmitted upward from an infection of the cervix or vagina — commonly chlamydia or gonorrhoea — and sometimes it spreads by blood from another infected site. In most cases it is passed from one sexual partner to another, and it can be transmitted through vaginal, anal or oral contact depending on the organism involved.
It often causes little or no symptoms. Many cases are found incidentally or not at all, and that is the reason it matters: the scarring it can cause happens whether or not you felt unwell.
What can vary
PID ranges from mild to severe.
Possible symptoms include:
- Lower abdominal or pelvic pain, usually worse on one side
- Unusual vaginal discharge, sometimes with an unpleasant smell
- Fever
- Pain or burning when urinating
- Pain during sex
- Bleeding between periods, or heavier periods
Crucially, up to half of cases have no symptoms at all, particularly chlamydia-related PID. That means “I feel fine” is not evidence that you do not have it.
Possible explanations
PID is diagnosed by symptoms, examination and testing — swabs, sometimes a blood test, and occasionally an ultrasound. There is no single test that rules it in or out reliably, so a clinician combines the picture.
Treatment is a course of antibiotics covering several organisms, and often an outpatient regimen plus a follow-up review. If you have an intrauterine device, that changes management and needs specialist input.
Why it is urgent
The fallopian tubes are the pathway to the egg. Scarring from PID can lead to:
- Ectopic pregnancy, which is a serious and potentially life-threatening complication
- Infertility from blocked tubes
- Chronic pelvic pain
None of this happens to everyone, and the risk increases with how many times PID occurs. But this is why it is treated promptly rather than watched.
Warning signs
- Fever with pelvic pain — the combination that matters most. Same-day assessment.
- Pelvic pain that suddenly worsens, or that comes with vomiting or shoulder-tip pain.
- Unusual discharge with pelvic pain, particularly after a new partner.
- Any pelvic pain with known or suspected infection.
What to do next
Get assessed. If PID is confirmed, complete the full antibiotic course — stopping early is associated with worse outcomes.
Your partner should also be tested and treated, since reinfection is a common route to recurrence.
Self-care
No self-care treats PID. It needs antibiotics.
While you are unwell: rest, fluids, and the pain relief you would normally use. Do not have sex until you have finished treatment and your clinician says it is safe.
When to seek help
Routine: not applicable — PID is not something to watch.
Prompt: pelvic pain with discharge, or after a new partner.
Emergency: fever with pelvic pain; sudden severe pelvic pain; vomiting with pelvic pain.
How to talk about it
“I’ve had pelvic pain and a discharge for a week.”
“I have a fever and bad pelvic pain.”
“I was treated for chlamydia and the pain hasn’t gone.”
Mentioning the discharge, the timing and any fever is what changes the urgency assessment. “My stomach hurts” does not.
Myths and stigma
“PID means you slept with a lot of people.” Most PID follows an untreated infection such as chlamydia or gonorrhoea, and a substantial proportion of cases happen without the person knowing they had an infection at all, because the original infection was silent.
“It just means bad cramps.” Severe or one-sided pelvic pain is not the same as ordinary period pain, and dismissing it is the main reason PID causes lasting damage.
“If you take the pills it is sorted.” Completing the course and having partners treated matters, because reinfection is a common route to recurrence.
Prevention
PID is usually secondary to another infection, so the prevention that matters most is preventing and treating that:
- Condoms reduce the risk of acquiring chlamydia and gonorrhoea, which cause most PID.
- Regular STI testing is the highest-value intervention, because the infections that cause PID are usually silent and therefore usually untreated.
- Treating partners prevents reinfection.
- IUDs do not cause PID, which is a persistent and widely believed myth. They are, if anything, protective.
The fact that most PID is silent means the most effective prevention is routine testing rather than any behavioural rule.
Related articles
Sources
Public sources are linked so you can read the detail rather than take this site’s word for it. None of this has yet been reviewed by a qualified clinician — see how we handle medical review.
References
Where this comes from
Linked so you can check it against a recognised public health source rather than take this site's word for it.
- Pelvic Inflammatory Disease — CDC US Centers for Disease Control and Prevention (opens in a new tab)
- Pelvic inflammatory disease — NHS NHS (opens in a new tab)
These are public sources from recognised health organisations, linked so you can read the detail rather than take this site's word for it. Reading them does not tell you whether any of it applies to you, and none of these articles has yet been reviewed by a qualified clinician. How we handle sourcing and review.