There is a hard bag in the anus consider thrombosed external hemorrhoids, anal fistula, perianal abscess, internal hemorrhoids embedded and so on. 1. Thrombosed external hemorrhoids: is perianal subcutaneous blood pressure increase, excessive expansion rupture caused by. Triggers are drinking, spicy diet, sedentary, etc., clinical anal lumps, severe pain can not sit for a long time. Treatment of mild or non-acute hot water sitz bath-based, surgical thrombus stripping is also a treatment option. 2. anal fistula: is the anal canal rectum and the skin around the anus connected to the infected pipe. Caused by more infections, perianal abscess breakout, rectal anus injury or trauma, tuberculosis mycobacterium actinomycetemcomitans infection. Clinical symptoms are pus, pain, itching around the anus, etc., and there may be hard nodules or striae outside the anus on examination. Treatment is mainly based on surgery. 3. Perianal abscess: acute purulent infection occurs in the soft tissue space around the anal canal and rectum and forms abscess. Perianal subcutaneous abscess is the most common. Clinical examination in the parianal skin has redness and swelling accompanied by hard nodules. Treatment is mainly anti-infective treatment, if the formation of abscesses need to be cut and drained at the same time and then change the medicine. 4. internal hemorrhoid embedded: is the internal hemorrhoid three to four stages of prolapse can not be returned to the cause. The patient usually have repeated prolapse of internal hemorrhoids, once the embedded will have severe pain, activity is limited. Treatment is timely to the hospital to let the doctor reset or even emergency surgery. Hard packs in the anus may also be other reasons, you need to go to the hospital anorectal examination in a timely manner to clarify the diagnosis, and then according to the results of the targeted treatment to avoid delays in aggravation of the condition.