There is something drilling in the anus, the main consideration is parasitic disease, in addition to perianal eczema, psychiatric diseases can also cause such symptoms. Parasitic disease, to parasitic in the rectum and anal canal parts of the raphe mainly, when a large number of insects and in the perianal parts of the concentration of activities, such as female raphe ovipositing at night, the patient will feel obvious itching and insect drilling sensation; perianal eczema is the perianal parts of the skin disease, often accompanied by extremely strong itching symptoms caused by local nerve illusion, the patient will sometimes be similar to the illusion that there is something in the drilling; Mental illness, mainly refers to parasitic paranoia, mostly in middle-aged and elderly women, the symptoms are mainly itching, some patients will also appear in the whole body or local insects drilling, stinging, crawling away feeling, this disease is mainly psychological counseling and treatment, can be combined with tranquilizer pills and other drugs, play a calming and tranquilizing effect.