What is an STD? There is a broad and a narrow concept of STD. Broadly speaking, STDs are sexually related diseases. Traditionally, STDs include not only diseases caused by sexual contact, but also diseases of male and female genital organs, such as urethritis and prostatitis in men, vestibular adenitis and vulvar ulcers in women, etc. In addition, some atrial diseases are also included, such as infertility, sterility, hematospermia, seminal emission, etc. The narrow sense of STD refers to sexually transmitted diseases, the medical profession called STD (English SexuellyTransmittedDisease first letter of the abbreviation, that is, sexually transmitted diseases), commonly known as flower disease, meaning that the smoke, flowers and willow alley, prostitution caused by the disease. In the past, this category of diseases only included syphilis, gonorrhea, soft chancre, lymphogranuloma venereum and inguinal granuloma, but due to the change of people’s sexual activities, the World Health Organization expanded the scope of this category of diseases to more than 20 diseases in the early 70’s according to the objective reality of the increasing number of diseases transmitted by sexual intercourse, such as the familiar condyloma acuminata, genital herpes, AIDS, non-gonococcal sex, urethritis, trichomonas vaginalis, etc. Urethritis, trichomoniasis, mycosis, lice, bacterial vaginosis and even scabies and hepatitis are all classified as STDs. What are the common symptoms of STD patients? Since STD is a general term for a group of diseases, its symptoms naturally vary from disease to disease. However, there is a certain pattern to the symptoms of STDs, which is good for diagnosis and treatment. Generally speaking, the first symptom of STD is local symptom, that is, discomfort on male and female organs, such as ulcers, blisters, pustules, itching, pain, etc. Men are prone to see frequent urination, urgent urination, painful urination and urethral discharge, women are prone to see vulvar itching and sudden increase of leucorrhea. Local symptoms can be reduced or disappear within a certain period of time, but it does not mean that the disease has been cured, it only means that the disease has changed from acute to chronic and the lesion has developed to a deeper level, such as painful erection of the penis at night, discomfort in the perineum and anus in men, menstrual disorders and pain in the abdomen in women, all these symptoms indicate the involvement of the adjacent organs. In men, the prostate, testicles and epididymis may be involved, and in women, the adnexa and uterus may be involved. Further progression leads to the germs entering the bloodstream and spreading to more distant sites. Skin lesions such as syphilis are common, with red syphilis rashes on the palms of the hands and skin, and even hair loss. Gonorrhea can also include cutaneous gonorrheal impetigo, gonorrheal arthritis, and gonorrheal endocarditis. The following is a breakdown of some common symptoms of possible diseases: 1, frequent urination, urgent urination, painful urination: can be seen in gonorrhea, non-gonococcal urethritis, prostatitis. 2.Purulent discharge from the urethra: can be seen in gonorrhea. 3.Clear discharge from the urethral orifice: can be seen in non-gonococcal urethritis caused by chlamydia or mycoplasma infection. 4.Glans foreskin redness and swelling: seen in gonorrhea, glans foreskin inflammation, pubic herpes, etc. 5, pubic superfluous organisms: seen in condyloma acuminata, infectious molluscum contagiosum, benign tumors of the pubic area, etc. 6.Vulvar and glans foreskin ulcers: can be seen in glans vulgaris, herpes pubis, syphilis, gonorrhea, soft chancre, fourth venereal disease, fifth venereal disease, AIDS, fixed erythema drug rash, etc. 7. Genital pustules: can be seen in gonorrhea, herpes pubis, scabies. 8. Inguinal lymph node enlargement: seen in syphilis, soft chancre, inguinal granuloma, venereal lymphogranuloma, AIDS, etc. 9.Circumferential rash: can be seen in syphilis. 10.Itching of vulva: can be seen in pubic lice and scabies. 11.Foul-smelling leukorrhea: can be seen in trichomonas vaginitis, gonorrhea, mycotic vaginitis, etc. 12, pain in the genital area: can be seen in gonorrhea, herpes pubis, non-gonococcal urethritis. Is STD a modern disease? The answer is no. In the process of human evolution, sexual activity has always occupied a more important position, Fu Zi cloud: “food and sex.” Disease can come from the mouth, but also from the sexual behavior. In ancient medical texts, it is recorded that “gonorrhea”, “chancre”, “mold”, etc., but some sexually transmitted diseases are not inherent in China, but come from foreign exchange, from foreign infections. For example, syphilis was introduced to China by Portuguese traders in the 13th century and spread from south to north. Of course some STDs did not exist in ancient times, such as AIDS, an infectious disease only recognized in the 1980s, which began to spread among homosexuals, was highly lethal, and was later proven to be a disease caused by infection with an immunodeficiency virus (called AIDS virus). It can be called a modern disease. In conclusion, STDs have been around since ancient times, but the range of STDs is only expanding due to the expansion of human activities, increased communication and more casual sexual behavior.