Constipation symptoms can last for longer than six months, according to the ShareCare website. If it lasts for that long, it is referred to as chronic idiopathic constipation.
WebMD recommends seeking medical attention if symptoms persist for more than three weeks. Complications, such as hemorrhoids and rectal prolapse, may occur if constipation is untreated and symptoms last for a long period of time. Constipation typically results from insufficient fiber intake, insufficient water intake and infrequent exercise. The condition is also linked to diabetes, lupus, multiple sclerosis, Parkinson's disease, stroke and thyroid disease. Medications that can cause constipation include antidepressants, anticonvulsants, blood pressure medications and iron supplements.