Anal oozing out colorless odorless water may be hemorrhoids, sinusitis, proctitis and other diseases caused by the cause. 1. hemorrhoids: hemorrhoids are relatively common anorectal diseases, may be due to the anus is not clean after stool, eat spicy stimulating food caused. There is blood in the stool, hemorrhoidal mass prolapse, secretion flow and other phenomena. 2. Sinusitis: Sinusitis may be caused by bacterial infection. As the opening of the sinus is upward, it may allow bacteria to enter the sinus and multiply and grow here, causing inflammation of the sinus. Its typical symptom is anal pain during defecation, and there is also anal foreign body sensation and anal secretion outflow. 3. Proctitis: proctitis may be pathogenic microbial infection, not pay attention to personal hygiene or unclean sexual intercourse, sexually transmitted diseases, may appear diarrhea, fever, nausea and vomiting, blood in the stool, rectal bleeding or rectal discharge of mucus secretion and other phenomena. If the patient appears anal oozing colorless and tasteless water, it is recommended to consult a doctor in time to clarify the diagnosis, under the guidance of the doctor, take appropriate treatment to avoid delaying the aggravation of the condition.