Sexually transmitted diseases (STDs) are infections that are spread mainly by sexual contact. They are caused by bacteria, viruses, or parasites, and there are dozens of different types of STDs. Some of the most common STDs include:

• Chlamydia
• Gonorrhea
• Syphilis
• Genital herpes
• Human papillomavirus (HPV)
• Trichomoniasis
• Pubic lice (crabs)

STDs can cause a variety of symptoms, including:

• Unusual discharge from the penis or vagina
• Sores or warts on the genital area
• Painful or frequent urination
• Itching and redness in the genital area
• Blisters or sores in or around the mouth
• Abnormal vaginal odor
• Anal itching, soreness, or bleeding
• Abdominal pain
• Fever

Many STDs have no symptoms, so people can have an infection but not know it. This is why its important to get tested regularly if you are sexually active. STDs can be diagnosed through a variety of tests, including blood tests, urine tests, and swabs of the affected area.

Its important to practice safe sex to prevent the spread of STDs. This includes using condoms, getting vaccinated against HPV, and getting tested regularly if you are sexually active.