Very dizzy and nauseous: Firstly, it should be considered to be caused by insufficient blood circulation in the brain. Second, it may also be due to the presence of drug poisoning, chemical injury, heavy metal poisoning, carbon monoxide poisoning, etc., which may also cause dizziness and nausea in patients. In addition, dizziness and nausea may also occur due to brain diseases such as meningitis, cerebral edema, elevated intracerebral pressure, tumor compression, etc. In addition, patients may also have neurosis or fever. Also, it cannot be ruled out that the condition is due to excessive stress or mental weakness. In daily life, patients should look for the cause of the disease and carry out symptomatic treatment. Patients should also avoid contact with heavy metals and chemical reagents in daily life, and if necessary, go to the hospital for further examination and symptomatic treatment.