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Regarding your question

what are the causes of black stool ?

1. upper gastro-intestinal bleeding
2. peptic ulcer
3. divreticulosis
4. cancer

what is the treatment of peptic ulcer ?

• esmoprazole 40 mg once per day
• metronidazole 500 mg three times per day
• clarithromycim 500 mg twice per day

what are the causes of black stool ?

1.Excessive usage of analgesia like non-steroidal anti-inflammatory drugs like trofen or diclofen
2.Usage of aspirin
3.Smoking
4. Excessive alcohol drinking

Signs :

1.heart burn
2. vomiting
3. bloating
4. vomiting of blood in severe untreated cases
5.severe abdominal pain due to perforation of stomach or small intestine in sever cases
5. dark or brown stool (melena) due to bleeding

Diagnosis :

Peptic ulcer can be diagnosed by taking full medical history of the patient , then do the following test :
1.CBC test to determine the amount of hemoglobin
2. doing H.pylori stool antigen test
3. do endoscopy in old patient above 50 to exclude cancer .
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