Diarrhea, dizziness, weakness and vomiting may be related to food poisoning or due to acute gastroenteritis, gastrointestinal colds and other causes. 1. Food poisoning: for example, eating uncooked lentils, shrimps, crabs and other foods is likely to cause food poisoning, you may have diarrhea, dizziness, weakness, want to vomit and other symptoms. 2. Acute gastroenteritis: common in summer and fall, usually due to overeating, dietary impurity and other reasons, resulting in the gastrointestinal mucosa to produce an acute inflammatory response. It may cause diarrhea, dizziness, weakness and vomiting. 3. Gastrointestinal colds: usually caused by viral infections, in addition to coughing, nasal congestion, runny nose, fever and other symptoms, may also cause diarrhea, vomiting and other gastrointestinal symptoms. Fever and diarrhea may also cause dizziness and weakness. If you have diarrhea, dizziness, weakness and want to vomit, you should consult a doctor as soon as possible to clarify the cause and then give targeted treatment.