Dizziness, nausea and dry heaving may be caused by hypoglycemia, blood pressure changes, brain diseases and early pregnancy reactions. 1. Hypoglycemia and blood pressure changes: When hypoglycemia occurs and blood pressure fluctuates (too high or too low), it may be manifested as dizziness, nausea, dry heaving and other symptoms, and timely blood sugar and blood pressure measurements should be taken. 2. Brain diseases: brain hemorrhage, brain tumors, intracranial infections, etc., may cause increased intracranial pressure and symptoms such as dizziness, nausea and dry heaving. 3. Early pregnancy reaction: After pregnancy, women will have different degrees of early pregnancy reaction, mainly manifested as dizziness, nausea, want to vomit, poor appetite and so on. When the symptoms of dizziness, nausea and dry-heaving occur, we should go to the hospital in time to consult the doctor, clarify the cause of the disease, and then standardize the treatment according to the doctor’s guidance.