 [ Symptoms ] 72 year old mother has not had a bowel movement in 5 days what could it be what type of doctor treats [ Disease ] your mother may be experiencing constipation a primary care doctor can evaluate her symptoms and do a physical exam there are many possible causes of constipation some common causes are a medication side effect dehydration from inadequate water intake and thyroid problems here is a link to an article about constipation <link> take care