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If you recently had suffered from illness, then change in bowel movements is common with that. Other causes for such stool are- Colitis, Crohn's disease. Sometimes lactose may the cause, so you should eliminate dairy products. If symptoms persists for more than 2 weeks, then you should be seen by your doctor.Your doctor can order some tests like -full blood count, urea and electrolytes, liver function tests, vitamin B12, folate, calcium, ferritin, ESR and CRP. Thyroid function tests , stool culture.
Capsule endoscopy can identify pathology of the small bowel like ulcer ,vascular lesion, tumours . It is very beneficial investigation to make a diagnose. So yes, you should get this done to evaluate the cause.