Chlamydia is often called “the silent epidemic” because infections are very common yet many people do not know that they are infected. Chlamydia is especially widespread among young people under the age of 25. Chlamydia is easily treated, but if left untreated, it can cause severe reproductive and other health problems, particularly in women. If you are infected, your sexual partner(s) should also be tested and treated as well. People who are infected have a higher risk of developing other sexually transmitted diseases, including a 3 to 5 times greater risk of acquiring HIV if exposed to it. The diagnosis of a sexually transmitted disease should not be ruled out if the test is negative; patients’ clinical symptoms and history should also be considered.