Stomach upset and dizziness may be caused by gastrointestinal colds, gastrointestinal diseases, as follows: 1. Gastrointestinal colds: refers to a cold accompanied by gastrointestinal dysfunction, usually caused by cold or bacterial or viral infection. Mainly gastrointestinal reactions, manifested as abdominal pain, diarrhea, nausea, vomiting, accompanied by dizziness, fever, fatigue, chills and other symptoms, and in severe cases, physical weakness, electrolyte disorders, dehydration, immune deficiency symptoms. No. 2, organic gastrointestinal diseases: such as acute gastritis, gastric ulcer, duodenal ulcer, pyloric obstruction, intestinal obstruction, tumors and other diseases. When the patient has severe abdominal pain, dizziness and even shock symptoms will appear. Many chronic diseases have a long course, often recurrent and prolonged, and the patient will have symptoms of emaciation, malnutrition, weakness of limbs, headache and dizziness.