Chlamydia is a common sexually transmitted disease (STD) caused by the bacteria Chlamydia trachomatis. It can be spread through unprotected vaginal, anal, or oral sex, and can also be passed from a mother to her baby during childbirth. Chlamydia often does not cause symptoms, so many people who have it may not know they are infected and can unknowingly spread it to others. However, some symptoms of chlamydia in women include abnormal vaginal discharge, burning sensation when urinating, and pelvic pain, while men may experience discharge from the penis, burning sensation when urinating, and pain and swelling in one or both testicles. If left untreated, chlamydia can cause serious health problems such as pelvic inflammatory disease (PID), which can lead to infertility, chronic pelvic pain, and ectopic pregnancy in women. In men, chlamydia can cause epididymitis or epididymo-orchitis, which is inflammation of the testicles and tubes that carry sperm from the testicles. Chlamydia can be treated and cured with antibiotics, but it is important to receive treatment as soon as possible to prevent complications and further spread of the infection. To prevent chlamydia, it is recommended to use a condom every time you have sex and to get tested regularly if you are sexually active.