The symptoms of acute gastroenteritis depend on the cause, including gastroenteritis caused by a stomach flu or bacterial infection. The symptoms of gastroenteritis from a stomach flu usually include fever, chills, dizziness, fatigue, body aches, stomach pain, diarrhea with watery stools, sometimes accompanied by vomiting and bloating. Routine stool tests often show no significant abnormalities. Acute gastroenteritis caused by bacterial infection typically manifests as stomach pain and diarrhea, accompanied by fever and chills, with stools that are mucous in nature. Routine stool tests often reveal the presence of white blood cells, pus cells, or phagocytes, and a routine blood test may indicate an increased white blood cell count. Treatment methods vary and generally involve symptomatic treatment, which usually leads to gradual relief.