Dizziness after vomiting is mainly caused by the following reasons. First, the loss of body fluid after vomiting is not replenished in time, and the effective circulating blood volume decreases, resulting in a relative decrease in blood supply to the brain, causing a relative decrease in blood supply to the cerebellum and vestibular nucleus, resulting in ischemic dizziness. In addition, after vomiting, due to the loss of body fluids, the body’s blood viscosity will increase, and due to the increase in blood viscosity, blood flow is slow, resulting in cerebral ischemia, which will also cause dizziness symptoms. It is recommended to drink more warm water after vomiting to replenish the amount of body fluid and ensure effective circulation of blood. Finally, the likely cause of dizziness due to vomiting is the presence of inflammatory factors due to the primary underlying disease of vomiting, which leads to inflammatory dizziness.