Hello doctor im 27 years old i had diarrhea black stool last week for one day. i went to ed they said it was blood. ct abdomen and pelvic was normal. im scared, what could this be? my hemoglobin level dropped due to bleeding 11.2. im healthy man?

Follow up with gastroenterologist will be needed. Stop taking any over the counter meds or supplements. The source of the bleeding needs to be determined in the gastrointestinal system with upper and lower endoscopies.

There are many possible etiologies to bloody stools but usually it is due to an ulcer. A stomach ulcer could cause the dark blood. You need to follow up with GI and get scoped-you likely need an upper and lower endoscopy to diagnose what the issue is so it can be treated. If you have an ulcer, medication will be given to treat it. Good luck!