Loss of appetite, nausea, want to vomit, body weakness, should be taken according to the cause of the disease treatment, if it is gastrointestinal tract diseases, should choose multienzyme tablets and other digestive drugs; if it is the reaction of early pregnancy, can be combined with vitamin B6 to alleviate the symptoms; if it is the cervical spine disease, can be adjusted through the life, flunarizine and other medication, such as alleviating the symptoms. 1. Gastrointestinal diseases: for example, various types of gastritis, gastric ulcer, gastric cancer, etc. Gastritis and gastric ulcer should be treated with medicines such as omeprazole, doxorubicin tablets, domperidone, etc. in time; and if it is gastric cancer, it should be operated at the earliest possible time. 2. Early pregnancy reaction: women may have early pregnancy reaction in the early stage of pregnancy, which may cause loss of appetite, nausea and vomiting, and body fatigue. You can take vitamin B6 tablets to relieve the symptoms, eat small and frequent meals and avoid mental tension. 3. Cervical spine disease: cervical spine degenerative disease, may compress the carotid artery, resulting in insufficient blood supply to the brain, will also appear loss of appetite, nausea and vomiting, body weakness. You can choose traction, physical therapy and other measures, you can also take flunarizine capsules and other drugs to regulate, while avoiding long-term head down, do more head up exercise, such as playing badminton, basketball, swimming and so on. Loss of appetite, nausea and vomiting weakness, there may be other reasons, you need to go to the hospital for further examination, to clarify the cause of the treatment prescribed by the doctor.