I am passing maroon colored stools. Could it be due to stomach bleeding?

Hi,

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You might be having gastritis because of Ibuprofen and resulting into maroonish stools. Are you having that more than once since a couple of days? In the case of stomach bleeding, the stools are very dark and more blackish like tar rather than maroonish. If you are feeling weak and looking pale, then you should visit Emergency Room as soon as possible. A single episode of maroonish stools could be due to other causes as well such as edible colors in food, antibiotics, etc. Currently, you can get a basic test like stool routine examination and look for occult blood in it. If detected, then you might need an upper GI endoscopy to determine any source of bleeding.