The brain is a vital organ of the body and can be subject to a variety of diseases. Usually, it is divided into traumatic brain injury, cerebrovascular disease, degenerative brain disease, parasitic disease, inflammatory disease, autoimmune disease and tumor disease according to the etiology. If patients have abnormal symptoms such as dizziness and headache, they need to go to the hospital for electrocardiogram, cranial CT and other related examinations to clarify the causes and then carry out targeted treatment. 1. Traumatic brain injury: it is a trauma that occurs in the skull, often caused by impact, fall and other reasons, common traumatic brain injuries include cranial trauma, cerebral contusion, subdural hematoma, etc. 2. Cerebrovascular disease: it is one of the common brain diseases and refers to the vascular of the brain in general. Various diseases, such as cerebral hemorrhage, transient ischemic attack and various lacunar infarcts, etc.; 3. Brain degenerative diseases: mainly refers to cerebral white matter degeneration, usually caused by damage to central nerve cells in the white matter of the brain. Common degenerative brain diseases such as Alzheimer’s disease, frontotemporal dementia, Lewy body dementia, Parkinson’s disease, Parkinson’s disease dementia, etc.; 4, brain parasitic diseases: refers to parasitic invasion of the human brain and diseases caused by parasites, such as cysticercus, amoeba and other parasites can be parasitic in the human brain; 5, inflammatory brain diseases: often caused by the invasion of external pathogenic bacteria into the brain or microbial infectious diseases, common brain Inflammatory diseases encephalitis, meningitis, etc.; 6, autoimmune diseases: refers to diseases caused by the immune system’s immune response to the components of its own body, such as multiple sclerosis, optic neuromyelitis optica spectrum diseases, autoimmune encephalitis, etc.; 7, tumor diseases: common such as glioma, meningioma, etc. In addition, various brain cell abnormalities can also cause brain tumors, such as medulloblastoma, etc.; 8. Other: brain diseases are also seen in some genetic metabolic diseases, such as mitochondrial encephalomyopathy. Also some diseases of the internal system can cause patients to develop encephalopathy, such as hepatic encephalopathy, renal encephalopathy, etc.