Nausea may be caused by physiological factors such as diet, pregnancy, drug factors, or pathologic factors such as digestive diseases, neurological diseases, vestibular dysfunction, and so on. 1. Physiological factors: nausea can be caused by eating too much cold, spicy and other stimulating or greasy food that is difficult to digest, or by overeating and other bad behaviors. In addition, nausea and vomiting can occur during pregnancy. 2. Drug factors: certain drugs such as antibiotics, metformin, anti-tumor drugs, etc., may cause nausea and other adverse reactions. 3. Digestive system diseases: such as gastroenteritis, peptic ulcer, inflammatory bowel disease, irritable bowel syndrome, gastrointestinal tumors, etc., the patient may feel nausea at the same time acid reflux, belching (hiccups), abdominal distension and abdominal pain and other symptoms. 4. Neurological diseases: such as cerebral hemorrhage, intracranial infection, intracranial tumors, etc., which will increase intracranial pressure and compress the nerves in the brain, resulting in nausea. 5. Vestibular dysfunction: mainly refers to the lesions of the vestibular system such as balloon, semicircular canals and vestibular nerves under the stimulation of ischemia, hypoxia and inflammation, etc. Patients may have autonomic nervous system symptoms such as nausea and vomiting, pallor, and cold sweating, and at the same time, they may also have symptoms such as vertigo, gait abnormality, headache, easy to tilt when walking and loss of vision, etc. If patients have nausea for a long time or repeatedly, it will cause the feeling of nausea, which may cause the feeling of nausea. If nausea exists for a long time or repeatedly, it is recommended to consult a doctor in time to identify the cause of the disease and carry out targeted treatment to avoid delaying the condition.