Chlamydia
If chlamydia isn't treated, it can sometimes spread and cause potentially serious problems.
In men, chlamydia can spread to the testicles andepididymis (tubes that carry sperm from the testicles), causing them to become painful and swollen. This is known as epididymitis or epididymo-orchitis.
The inflammation is usually treated with antibiotics. If it's not treated, there's a possibility it could affect your fertility.
Chlamydia is the most common cause of sexually acquired Reiter's syndrome (SARA). This is where your joints, eyes or urethra (the tube urine passes out of the body through) become inflamed, usually within the first few weeks after having chlamydia.
It can affect women who have had chlamydia, but is more common in men.
There's currently no cure for SARA, but most people get better in a few months. In the meantime, treatment with non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen can help relieve the symptoms.
In women, chlamydia can spread to the womb, ovaries orfallopian tubes. This can cause a condition called pelvic inflammatory disease (PID) .
PID can cause a number of serious problems, such as:
The symptoms of PID are generally similar to the symptoms of chlamydia , includingdiscomfort or pain during sex, pain during urination, and bleeding between periods and after sex.
PIDis usually treated with a two-week course of antibiotics .The risk of experiencing problems such as infertility islower ifit's treated early, so it's important to seek medical advice as soon as possible if you have symptoms of the condition.
If you have chlamydia that's not treated while you're pregnant, there's a chance you could pass the infection on to your baby. If this happens, your baby may develop an eye infection (conjunctivitis) and lung infection (pneumonia).
If your baby has symptoms of these conditions, your midwife or GP can arrange for a test to check for chlamydia and antibiotics can be used to treat the infection.
Untreated chlamydia in pregnancy may also increase the risk of your baby being born prematurely (before 37 weeks of pregnancy) or with a low birth weight, and might mean you're more likely to have a miscarriage or stillbirth .
Chlamydia is one of the most common sexually transmitted infection in the UK. Find out who is most at risk, where to get tested, and how it's treated.
Read about the possible symptoms of chlamydia that can be experienced by men and women, and find out when you should seek medical advice.
Read about who should have a chlamydia test, where you can get tested and what the test involves.
Read about how chlamydia is treated, including how long treatment lasts, whether you'll need to return to the clinic, and how long you'll need to avoid having sex.
Read about the possible complications that can develop if chlamydia isn't treated, including fertility problems in women and men.
Read Sally's story about how she discovered she had chlamydia when she was 16. She describes her symptoms and how she was diagnosed and treated.
Read the real story of Julie Dawson, who was diagnosed with chlamydia when she was 18.It had developed into advanced pelvic inflammatory disease (PID).