Smelly fluid after hemorrhoid surgery may be normal fluid that usually flows for about half a month to a month. It may also be a purulent infection where the foul-smelling fluid will persist and should be treated aggressively. 1. Normal liquid: after hemorrhoid surgery, the incision site will form an open wound, during this period there will be a small amount of blood and liquid outflow, is a normal phenomenon. A small amount of secretion in the wound after surgery will last for 2~3 weeks, but there should not be a bad odor. Fecal odor is normal, but there should not be a bad smell. If malodor occurs, please consult the doctor promptly to rule out infection. 2. Purulent infection: If the wound is contaminated by feces or other dirt after surgery, it may cause purulent infection, resulting in purulent discharge from the wound. You need to clean the wound in time, and use cefixime, ciprofloxacin and other drugs to fight infection, after active treatment, usually in about half a month to control the infection. It is recommended that patients with postoperative hemorrhoidal surgery, the trauma of foul-smelling liquid outflow, should promptly inform the doctor of the symptoms, and strictly comply with the doctor’s instructions for the appropriate diagnosis and treatment, to avoid aggravation of the condition, affecting the healing after surgery.