“What causes daily constipation?”

Most constipation is simply a slow colon (we call this chronic idiopathic constipation [CIC]) or related to irritable bowel. But it is also important to ascertain what you mean by constipation because what you experience may or may not meet with the strict medical definition of constipation. If it is simple CIC then eat more fiber, fruits and use over the counter laxatives like miralax and dulcolax.