Hi,
Since you have had a fissure, chances of recurrence are high. Constipation is just one of the causes of fissure. There can be other causes, for example, there can be a tear in anal canal, or there may be a foreign body present in body, or it can happen during normal labor.
Usually the fissure has bright red blood and not dark coloured blood. Since you have dark, it indicates that blood is coming from above in alimentary tract, which might be due to inflammatory bowel disease, irritabl ...
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