STIs, or sexually transmitted infections, are infections that are spread through sexual contact, including vaginal, anal, and oral sex. STIs can be caused by bacteria, viruses, or parasites and can affect both men and women.

Some of the most common STIs include chlamydia, gonorrhea, syphilis, herpes, human papillomavirus (HPV), and human immunodeficiency virus (HIV).

STIs can be transmitted through unprotected sexual contact with an infected partner, sharing of needles or injection equipment, or from mother to baby during pregnancy or childbirth. Some STIs, such as HPV, can also be transmitted through skin-to-skin contact.

Symptoms of STIs can vary depending on the infection and may include discharge or pain during urination, sores or blisters in the genital area, abdominal pain, fever, and fatigue. However, some STIs may not cause any symptoms, making it important for sexually active individuals to get regular screenings and check-ups with a healthcare provider.

Treatment for STIs may include antibiotics, antiviral medications, or antiparasitic medications, depending on the infection. Some STIs, such as HIV, do not have a cure, but there are medications available to manage symptoms and reduce the risk of transmission.

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