Hello and welcome to HCM
There are many causes of blood in stools. Some of them are mentioned below:
1. Peptic ulcer- Causes black or dark colored stools. as the bleed is high up in the intestine the blood is digested/ altered.
2. Diverticulitis- Causes stools mixed with blood. Diverticulosis
is a condition in which multiple pouch like structures arise from the anti-mesenteric border of the intestinal loop.
3. Carcinoma of the intestine- Cause stools mixed with blood. Carcinoma causes constitutional symptoms like decreased appetite, weight loss
4. Piles/ haemmorhoids- Causes fresh blood (bright red) after defecaetion
You need some investigations- complete hemogram, ultrasound
abdomen, and sigmoidoscopy/ coloscopy. Consult your doctor for same.
Thanks and take care
Dr Shailja P Wahal