How can one know if s/he has a sexually transmitted infection (STI)? How long does one take to become sick after getting an STI?

As the name suggests, an STD is transmitted through unsafe sex with an infected person. Symptoms of STDs vary and can appear within 1 week of exposure to 3 weeks. Symptoms of STD for men are quite easy to spot, usually appearing in/around the genital area. In women many STDs may not manifest symptoms initially. In men, symptoms include, a yellow/white discharge from the penis, inflammation of the testicles and prostate gland. A common symptom in women is a change in vaginal discharge – it may increase, become yellow or greenish, or develop a foul smell. Other symptoms common to all include boils/ blisters/ rashes, burning during urination and irritation and/or discharge from the anus. Untreated STDs can cause cervical and other cancers, chronic hepatitis, pelvic inflammatory disease, infertility, and other complications. However, when diagnosed and treated early, almost all STDs are completely curable.