To determine whether your child has megacolon or constipation, you can look at the clinical manifestations, X-rays and so on. 1. Clinical manifestations of megacolon: due to congenital or acquired stenosis, resulting in dilatation and thickening of the colonic intestinal tubes, the clinical manifestations of intestinal peristalsis disappearance, spasmodic contraction of the intestinal tubes. There may be constipation, abdominal distension, dirty stools and other symptoms, usually after defecation can be relieved, constipation is gradually aggravated, the disease progresses slowly, and the delay is not cured. 2. Clinical manifestations of constipation: constipation generally refers to less than three bowel movements per week, often manifested as difficulty in defecation, reduced frequency, dry and hard stools, after defecation, there is still a feeling of not clean, the serious can appear anal fissure, blood in the stools, local symptoms, usually without treatment, can be relieved through the improvement of lifestyle, eating high-vitamin, high-fiber food help. 3. X-ray of megacolon: X-ray abdominal standing film of children with megacolon may show narrowing and dilatation of intestines, fluid and gas accumulation, narrowing and dilatation of the segment is cone-shaped migratory segments, there may be gas-liquid plane. 4. X-ray of constipation: X-rays of constipated children usually show widening and dilatation of the colon, retention of feces in the bowel, or gas-liquid planes. Whether you have a megacolon or constipation, you need to seek medical attention in a timely manner to identify the cause of the disease and treat the symptoms under the guidance of your doctor.