 Not aging. It's totally normal to be constipated with belly pain, straining and bloating again and again. No way. You could have a chronic condition called irritable bowel syndrome with constipation or IBSC. Linzess or linaclotide is a prescription that treats IBSC in adults. Linzess works differently than laxatives to help relieve belly pain and let you have more frequent and complete bowel movements.