Nausea, vomiting and weakness is a relatively common symptom of acute gastrointestinal diseases, the causes of which are mainly the following: first, pregnancy reaction, in early pregnancy pregnant women will experience nausea, vomiting, especially before or after eating, when people vomit the whole body muscles are tense, when nausea, vomiting after the body weakness, at this time need to pay attention to rest, drink water or supplement To avoid the occurrence of hypoglycemia. The second aspect is to consider patients with gastric diseases, which commonly cause nausea, vomiting and weakness. The third aspect is the reaction to medication. Some medications have strong stimulating effects, and when people take them, they will cause strong stimulation to the stomach, resulting in nausea and vomiting, and vomiting is accompanied by muscle contraction, and after vomiting, they will show symptoms of weakness.