STDs is a collective term for a group of diseases that are primarily transmitted through sexual contact. Therefore, STDs are somewhat contagious. Also known as STDs, STDs are generally classified into six types, specifically syphilis, AIDS, gonorrhea, condyloma acuminata, genital herpes, and genital chlamydia trachomatis infection. Their main transmission routes are sexual transmission (including general intercourse, anal sex, oral sex), similar sex and indirect sexual contact transmission, etc. Several of them can also be transmitted through blood (for example, syphilis and AIDS can be transmitted through blood transfusion or sharing needles) or mother-to-child transmission (including AIDS and syphilis, which are transmitted vertically to the baby during pregnancy or during delivery through the infected mother). In addition to the six STDs mentioned above, diseases such as scabies, soft chancre, non-gonorrhea, bacterial vaginitis and ringworm that can be transmitted through sexual contact are also known as STDs in the broad sense, but such diseases are not part of the public perception of STDs. STDs are highly contagious, initially asymptomatic or mildly symptomatic, with serious consequences, and easily recurring and difficult to eradicate are their common characteristics. There is an increasing trend of prevalence of this group of diseases in the society. There should be a good concept of sexual life, cleanliness, insistence on protected sex, early diagnosis and treatment if there is a risk.