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Main cause of fissure is constipation
, so avoid it. To prevent this increase your water intake upto 12 to 14 glasses per day, take fibrous fruits, apple,papaya,green leafy vegetables.Avoid taking oily,spicy and junk foods.You can start with Homoeopathic medicines like TABLET Y-LAX , 2 TABLETS AT BED TIME DISSOLVED IN 1/2 CUP OF LUKE WARM WATER AT BED TIME to prevent constipation.
Thanks and take care