Hirschsprung Disease is a birth defect that causes severe constipation or intestinal obstruction. It occurs when nerve cells are missing from parts of the large intestine, preventing normal movement of stool. Symptoms often appear shortly after birth and can include constipation, vomiting, abdominal swelling, and poor weight gain. Diagnosis involves medical imaging and biopsy of the intestine. Treatment is usually a surgical procedure to remove the affected segment and connect the healthy parts of the intestine. Prognosis is generally good after surgery, though some may have ongoing bowel issues.