Which of the following is a common clinical manifestation of irritable bowel syndrome ( IBS )?

Mr. Santos, a 45-year-old male, presents to the clinic with complaints of recurrent abdominal pain, bloating and changes in bowel habits. He reports alternating episodes of diarrhea and constipation. Upon further assessment and the nurse notes that Mr. Santos experiences relief of symptoms after defecation. The Nurse suspects that Mr. Santos may have irritable bowel syndrome ( IBS ).