As constipation is the main culprit behind fissure-in-ano, all steps to avoid constipation will help to a great extent. A high-fiber diet and extra fluids to prevent constipation are recommended. This means eating more fruits, vegetables, cereals, whole meal bread, etc. and drinking at least 8 glasses (12 cups) of water a day. Reduced intake of coffee and alcohol also helps.
To relieve pain apply a warm towel to the area. Warm baths or Sitz baths also relieve pain. Use 8 inches of warm water in the bathtub, 2 or 3 times a day for 5-10 minutes. Do not expose the anal skin to hot bath water or hot shower water. Use only luke-warm water on this area.
No restrictions are necessary. In fact, physical activity reduces the likelihood of constipation.
For preventing infection gently clean the anal area with soap and water after each bowel movement. Do not put any creams or ointments, cornstarch, talcum or other powder, witch hazel, or anything else on or into the anus.