Ulcerative colitis often presents with alternating symptoms of constipation and diarrhea. Generally, colitis is characterized more by diarrhea, with fewer symptoms of constipation. What we commonly encounter in daily life is acute gastroenteritis, which frequently occurs suddenly, presenting with sudden diarrhea and abdominal pain, and in severe cases, watery stools. Most cases are due to irregular eating habits or consuming contaminated food. It is important to promptly rehydrate, choose sensitive antibiotics, rest adequately, and maintain a light diet with attention to food hygiene.