Chlamydia is a common sexually transmitted disease (STD). It affects both men and women and, in most cases, does not cause any symptoms. When it does produce symptom and signs, these may not appear for weeks after your infection. Symptoms in women include burning with urination and an abnormal vaginal discharge. Abdominal or pelvic pain is sometimes present. Blood in the urine, urinary urgency (feeling an urgent need to urinate), and increased urinary frequency can occur if the urethra is infected. In men, symptoms, when they occur, can include a discharge from the penis and a burning sensation when urinating. Pain in the testicles sometimes occurs. In both men and women, infection of the rectum can cause rectal pain, bleeding, and discharge from the rectum.