What Causes Black Stools?
Possible Diagnosis:Upper Gastrointestinal bleed, need further investigation
Detailed Answer:
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The symptoms described in the question is suggestive of Gastroindestinal bleeding.
Black stools is indicative of presence of digested blood in stools,which raises the concern of upper Gastroindestinal bleed.Several conditions like gastritis, gastric ulcers,esophagitis, tumors etc can cause such bleeding.
The dizziness he is experiencing is due to anemia associated with blood loss.
Your husband will need investigations including complete blood count,stool analysis and occult blood, hemoglobin levels, Upper GI endoscopy,abdominal Xray.
Since he is also suffering from constipation and his age also warrants the need for a colonoscopy also yo rule out any associated colonic pathology.
Please be advised to follow up with your primary care provider to undergo necessary investigations done.
Meanwhile drink.plenty of water,include diet rich in fiber like vegetables,fruit XXXXXXX oat and avoid caffeine to help relieve constipation. Psyllium based laxatives can also be tried.