what are the symptoms of ibs and what causes it?
['Pain and Cramping. Abdominal pain is the most common symptom and a key factor in diagnosis. ... ', 'Diarrhea. Diarrhea-predominant IBS is one of the three main types of the disorder. ... ', 'Constipation. ... ', 'Alternating Constipation and Diarrhea. ... ', 'Changes in Bowel Movements. ... ', 'Gas and Bloating. ... ', 'Food Intolerance. ... ', 'Fatigue and Difficulty Sleeping.']