1, cerebrovascular disease (stroke) Cerebrovascular disease, commonly known as stroke, is caused by the blockage or rupture of blood vessels in the brain, so that brain tissue does not get enough blood supply, and the affected nerve cells are thus necrotic, producing various symptoms of brain damage. It includes cerebral infarction, cerebral hemorrhage, subarachnoid hemorrhage, etc. Risk factors:Hypertension, especially in patients who are not treated properly. Heart disease, especially rheumatic heart disease, atrial fibrillation. Smoking and alcohol consumption and drug abuse. Obesity, diabetes mellitus. Hyperlipidemia, hyperviscosity. Common symptoms of cerebrovascular disease: acute onset of hemiplegia, persistent limb numbness and weakness, vertigo, unsteady walking, slurred speech, clumsy speech, gibberish, crooked mouth, slanted eyes, drooling, difficulty swallowing, incontinence, coma, etc. Cerebral infarction mostly starts in quiet time and manifests as acute appearance of the above symptoms. Patients with cerebral hemorrhage tend to develop during activity or emotional excitement, and often present with headache, vomiting, confusion, significantly increased blood pressure and the above-mentioned symptoms. Most of them have a history of hypertension. Younger patients tend to have arteriovenous malformations or aneurysms, and older patients tend to have aneurysms. Cranial CT is essential for the diagnosis of cerebral hemorrhage. Subarachnoid hemorrhage presents with an acute onset of severe headache, vomiting, confusion and cervical tonicity. Younger patients tend to have arteriovenous malformations or aneurysms, and older patients tend to have aneurysms. 2.Polyneuropathy (peripheral neuritis) Peripheral nerve damage caused by multiple causes (such as diabetes, heavy metal poisoning, malnutrition, etc.) is manifested by the gradual appearance of numbness, weakness and muscle atrophy in the hands and feet. Electromyography shows neurogenic damage and reduction of nerve conduction velocity. 3. Acute myelitis Acute inflammatory lesions of the spinal cord associated with infection and autoimmunity. There is a history of cold and diarrhea 1-2 weeks before the disease, and acute onset of bilateral lower limb or quadriplegia, hyperalgesia below the lesion plane, and difficulty in urinary and fecal discharge or incontinence. High cervical spondylitis may present with respiratory distress. Parkinson’s disease is a slow onset and progressive brain degenerative disease. 40-60 years of age is common, manifested as limb tremor, stiffness, slow movement, often from one side to the other, often with a dull face, body leaning forward, writing smaller and smaller, walking on one side of the hand swing less symptoms. Most patients take levodopa-like drugs have obvious effect. 5, Alzheimer’s disease Progressive development of brain degeneration disease. The main manifestation is gradually increasing intelligence loss, such as memory loss, can’t count, home lost, personality change, inappropriate behavior, etc. 6. Encephalitis Brain infection caused by various pathogens (bacteria, viruses, fungi, etc.). It often manifests as fever, headache, vomiting, mental abnormalities, confusion, etc. 7.Migraine Recurrent throbbing headache mainly on one side, mostly starting from youth, common in women, often with family history. However, brain tumor, cerebrovascular malformation, cerebral aneurysm, etc. should be excluded. 8.Cervical spondylosis is a clinical syndrome caused by cervical disc herniation or cervical osteophytes. There is often numbness and weakness of the upper limbs (especially the hands), soreness in the neck and shoulders, and difficulty walking when yo compress the spinal cord. 9, epilepsy Repeated, transient brain dysfunction caused by cortical nerve cell discharge. Adults mostly have brain lesions or sequelae. It is characterized by sudden onset of confusion, twitching of limbs, foaming at the mouth, purple lips, incontinence, etc. It usually lasts for several minutes and can stop on its own. EEG can help to make a clear diagnosis, and CT or MRI of the head can help to find the cause of the disease. 10. Myasthenia gravis is an autoimmune disease that occurs in the nerve-muscle junction. It often manifests as drooping eyelids, double vision, weakness of limbs, difficulty in swallowing and even difficulty in breathing, light in the morning and worse in the afternoon and evening. Symptoms can be significantly improved after 30 minutes of intramuscular injection of neostigmine