Hi, read and understood the history related to your sister's problem if passing blood in the stool and she is seeing a GI Doctor tomorrow.
The causes can be:
-Fissure in anus, a crack at the anal verge.
-Polyp in the rectum.
This can be easily diagnosed on inspection and per-rectal examination.
Colonoscopy should be done at a later date to rule out any primary colonic pathology.
In the meantime, I would advise her the following:
- Sitz bath.
- plenty of fibers in diet.
-mild laxative at bedtime
-Avoid foods and beverages that cause constipation.
Once examined and diagnosed the treatment can be medical if possible and surgery if indicated.
Hope this helps.
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