The next day after internal hemorrhoid sclerotherapy, anal swelling, bleeding pain, sclerotherapy allergy and other symptoms may occur. 1. Anal swelling: after internal hemorrhoid sclerotherapy, patients will usually lead to necrosis and ulceration of hemorrhoidal tissues, triggering anal discomfort; if the injection site is too deep, it will lead to submucosal abscess and perianal infection, which will cause irritation to the intestinal mucosa and anus, and anal swelling symptoms will appear. 2. Bleeding pain: patients after internal hemorrhoid sclerotherapy, because the injection site is very close to the dentate line, may cause pain, rectal mucosal damage, atrophy, local bleeding, pain symptoms. 3. Sclerotherapy allergy: patients in the internal hemorrhoid sclerotherapy, may have an allergic reaction to the sclerotherapy, usually will appear local skin redness, rash, itching and other symptoms. Patients are advised to observe and review regularly after the operation, and when uncomfortable symptoms appear, they should go to the hospital in time for consultation and treatment.