Megacolon is a medical condition characterized by an enlarged colon. Other terms that can be used to refer to megacolon include Hirschsprung's disease, chronic idiopathic intestinal pseudo-obstruction, and colonic pseudo-obstruction. Other synonyms for the term megacolon can also include dilated colon, giant colon, and colonic dilation. Symptoms of megacolon may include constipation, abdominal pain, bloating, and vomiting. While the condition can be congenital in some cases, it can also be acquired as a result of certain medications, neurological disorders, or as a complication of other medical conditions. Megacolon can be a serious condition and patients should consult with a healthcare professional if they experience symptoms of the condition.