Sudden feeling of dizziness, nausea and chest tightness may be caused by insufficient blood supply to the brain due to heart disease. It may be caused by severe arrhythmia or coronary artery disease. Patients with arrhythmia and coronary artery disease may experience chest tightness and shortness of breath, as well as discomfort in the precordial region. In severe cases, there may be a decrease in the pumping blood supply to the heart, which may easily lead to insufficient blood supply to the brain, including insufficient blood supply to the cerebellar brainstem and insufficient blood supply to the brain. Patients with insufficient blood supply to the cerebellar brainstem may experience dizziness and nausea, as well as balance disorders and ataxia; patients with insufficient blood supply to the brain may experience blackness in front of the eyes, and may also experience sensory impairment and motor dysfunction in the limbs. It may also be caused when the patient’s blood pressure is too high and should be tested. It may also be caused in patients with severe hypotension. It may also be a kind of peripheral vertigo, such as Meniere’s syndrome. Most of the patients with Meniere’s syndrome are related to mental tension and exertion, and patients with dizziness can have visual rotation, deafness and tinnitus at the same time, which is mainly treated with symptomatic anti-dizziness treatment, and the commonly used drugs are Cipro and vertigo stop.