Dizziness is a common functional disorder of the brain and one of the common clinical symptoms. It is a sensation of dizziness, head swelling, light-headedness, shaking in the brain, and blurred vision. Dizziness is different from vertigo, which should be accompanied by balance perception disorder or spatial position perception disorientation, and can feel the peripheral environment or oneself rotating, moving or shaking. Vertigo is mainly caused by vestibular dysfunction and is mainly seen in brain and ear, nose and throat related lesions, while dizziness is mostly caused by brain dysfunction due to systemic diseases. There are many causes of dizziness, mainly involving the nervous system, ear, internal diseases, drugs, mental and emotional aspects. 1. Neurological system: cerebral small vessel lesions, chronic cerebral ischemia, and traumatic brain injury can cause brain dysfunction, which can manifest as symptoms of dizziness; some special types of epilepsy are seizures in the form of dizziness, which require specific judgment by clinicians; 2. Ear lesions: diseases in the ear affect the balance and cause dizziness, such as otoliths and Ménière’s disease, which often manifest as dizziness after acute seizures; 3. Internal diseases: diseases of the internal system, such as hypertension, hypotension, various cardiovascular diseases, anemia, infection, poisoning, hypoglycemia, etc. can lead to a decrease in cerebral blood supply, resulting in symptoms of dizziness 4, cardiac lesions: heart disease, coronary artery disease, etc. resulting in paroxysmal tachycardia, paroxysmal atrial fibrillation, ventricular fibrillation and other arrhythmias, can lead to acute cerebral ischemia, manifesting dizziness, blurred vision, stomach discomfort, and 5. Drugs: poisoning by streptomycin, neomycin, kanamycin, gentamicin, etc. can lead to damage to the auditory nerve resulting in dizziness. In addition to dizziness, patients also suffer from vertigo and sensorineural deafness due to damage to the cochlear nerve. Chronic lead poisoning is mostly manifested as neurasthenia syndrome, with dizziness, headache, insomnia, forgetfulness, fatigue, dreaminess as the main symptoms, and also hypothermia, loss of appetite, etc. 6. mental emotion: anxiety and depression and other mental illnesses often have dizziness and other symptoms when they are manifested in somatization, usually accompanied by panic, headache, insomnia and other somatization symptoms, which should be considered after fully excluding organic lesions. In conclusion, dizziness is a common symptom, and many diseases can show symptoms of dizziness. There is a great difference in the severity of diseases that cause dizziness, and dizziness and vertigo due to key organs such as the heart and brain are often risky and should be dealt with urgently. Dizziness is a common disease in life that should be taken seriously enough and medical help should be sought to find the cause and treat the symptoms in a timely manner.