What causes black tarry stool?
Go to the emergency room or general surgeon as soon as possible.
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Black tarry stools can be due to a number of causes. However a stool test for occult blood should be done initially to make it clear if its blood or not.Your age is just 46 so swelling in abdomen or any other problem should not be because of age.
There are many causes ranging from harmless illness to life-threatening disease conditions which can cause bleeding with stools. Usually the blood will be bright red if the bleeding is from the site closer to the anus or if it flows freely and rapidly from the small intestine; if the blood remains in the gut for a longer time without getting passed in stools then the bacteria break down the blood cells and cause the black color so is the reason the stools are black in color sometimes.
You have not specified the color of your stool in details hence would suggest you common causes for both upper and lower bleeds.
Common Causes not related to any specific disease.
Smoking, Regular alcohol intake, chewing of betel leaves or tobacco.
Eating of spicy food and oily food.
Stress, strenuous exercise can sometimes cause.
Intake of any medicines or Drugs.
Ulcerative colitis, Crohn’s disease, Inflammatory bowel disease, Gastroenteritis(upper GI usually)
Fissure in ano
Piles or hemorrhoids
So they are the most common causes. As you have not mentioned any history of yours kindly go through common causes first. If that's not your case then investigation of the anal canal should be done by proctoscope to rule out fissure, Hemorrhoid etc. an ultrasound abdomen should be done initially to rule out chances of inflammatory bowel disease.
Do you strain a lot while passing stools?
Are you constipated? Or do you ever feel constipated while passing stools?
Please let me know about your diet schedule too.
Hope I answered your query, please do follow-up with answers to the questions.
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