Anal dampness is a relatively common phenomenon. The reasons for its occurrence are, on the whole, divided into physiological and pathological causes. 1, daily life, especially in the summer when it is hot, wearing non-breathable, non-sweat-absorbing intimate clothing, there will be sweat impregnation, around the anus will naturally occur more humid phenomenon. In winter, wearing clothes will be more, coupled with the high local temperature in this area, sweat generation, sweat is not easy to evaporate, usually do not pay attention to cleanliness and hygiene, will also lead to dampness around the anus. This is the more common physiological reasons for anal dampness. 2, when the human body occurs in some diseases will also appear anal dampness. (1) proctitis is a relatively common disease. Proctitis can cause excessive inflammatory fluid to be generated in the rectum and anus, leaking from the anal opening. This fluid can be pus-like or sometimes have a clearer, more transparent appearance. This fluid adheres to the perianal area and, if not removed promptly, can lead to perianal dampness. (2) Hemorrhoids are also a major cause of anal dampness. After the occurrence of hemorrhoids, poor blood circulation in the anus and edema of the hemorrhoid nucleus can lead to increased secretions, which flow out around the anus through the anus and are not easily removed after gathering, causing anal dampness. (3) Some sexually transmitted diseases, such as perianal condyloma acuminatum, can be complicated by some inflammatory stimulation, leading to increased skin exudation and causing anal dampness. (4) A rare cause is perianal malignant tumor, which can cause perianal dampness due to the infiltrative growth of the tumor, destruction of normal tissues, or even concurrent local infection, resulting in increased secretions, mostly presenting plasma-like secretions. There are various reasons for anal dampness, usually wearing cotton sweat-absorbing and breathable clothes can reduce the occurrence of anal dampness. For some long-term existence of anal dampness, you need to go to the hospital for examination to avoid aggravation of some diseases.