This document discusses diarrhea, constipation, and vomiting. It defines each condition and lists their common causes and treatments. For diarrhea, the most common causes are infectious agents transmitted through feces that can cause acute diarrhea lasting less than 2 weeks. Treatment involves fluid and electrolyte replacement. For constipation, causes include low fiber diet, medications, and gastrointestinal/neurological conditions. Management focuses on lifestyle changes and laxatives. Vomiting can be caused by gastrointestinal or non-gastrointestinal illnesses. Treatment involves fluid resuscitation and treating the underlying cause. Complications of all three conditions include dehydration, electrolyte imbalances, and renal failure if not properly treated.