Deficiency caused by vomiting is mainly due to electrolyte imbalance, decreased blood volume, etc. Symptoms can be relieved through dietary regulation and medication. 1. Electrolyte imbalance: If you experience mild weakness after vomiting, and the water and electrolyte imbalance in your body is caused by vomiting, you can take potassium and calcium gluconate orally to replenish potassium, calcium and other electrolytes. If you can eat a small amount of food, you can choose bananas, milk, etc. to replenish potassium and magnesium ions. 2. Decrease in blood volume: a large amount of body fluids are discharged when vomiting, the body appears to be muscle tremor or weakness, shivering, at this time should immediately go to the hospital, in the hospital through the intravenous infusion of timely supplementation of blood volume. Vomiting leads to weakness and it is recommended to seek immediate medical attention and treatment under the guidance of a doctor.