Nausea, vomiting and generalized weakness may be related to digestive system diseases and central nervous system diseases. 1. Digestive system diseases: when the patient has a long time of poor diet and irregular diet, it may cause acute and chronic gastroenteritis, which may cause the patient to have nausea, vomiting, generalized weakness and other clinical symptoms. 2. Central nervous system diseases: when the brain is traumatized, it may lead to central nervous system diseases, which may also lead to nausea, vomiting, general weakness and other clinical symptoms. It is recommended to go to the gastroenterology or neurology department of the hospital as soon as possible, and cooperate with the doctor to improve the relevant examinations to find the specific causes of nausea, vomiting and general weakness, and accept the treatment for the specific causes in order to reduce the patient’s pain.