The itching inside the anus is considered to have the following possibilities: 1. itching caused by internal hemorrhoids, mostly due to the recent consumption of too much spicy, irritating food, causing the aggravation of hemorrhoids, the nucleus of the hemorrhoids appear edema, congestion and painful itching sensation. 2. the anal sphincter is relaxed, intestinal secretions or intestinal mucus outflow, stimulating the local skin itching sensation. 3. perianal abscess caused by an acute purulent disease, the attack will appear fever, urination and defecation, severe pain and itching sensation. 4. It is a good idea to take a look at the following photos to get a better idea of what to expect. 4, anal fissures, when the skin is cracked open, there will be severe pain, if stimulated by feces will appear itchy feeling. 5, anal sinusitis, neurodermatitis and other causes, it is recommended to go to the hospital in a timely manner.