Intracranial lesions can be categorized into infection, hemorrhage, and occupancy, while the site of onset is also categorized into frontal lobe, temporal lobe, parietal lobe, occipital lobe, cerebellum, and so on. Initially, the patient may present with fever, hemiparesis, hemianopsia, epilepsy, and other symptoms. 1. Infection: initially there may be fever, nausea, vomiting, headache, drowsiness and other symptoms. 2. Occupying lesions such as hemorrhage or tumors: initially, there may be no symptoms, or there may be symptoms such as meningeal irritation signs, which usually include headache and cervical rigidity. 3. Location of lesions: (1) Frontal lobe lesion initial symptoms: may appear contralateral hemiparesis, facial paralysis, motor aphasia and other manifestations. (2) Parietal lobe lesions: sensory epilepsy, contralateral lower 1/4 quadrant hemianopsia, and other symptoms. (3) Initial symptoms of temporal lobe lesions: contralateral ipsilateral hemianopsia, temporal lobe epilepsy, sensory aphasia, and psychiatric symptoms. (4) Occipital lobe lesions: Contralateral ipsilateral hemianopsia may occur. (5) Initial symptoms of cerebellar lesions: nystagmus, ataxia and hypotonia. If the above symptoms occur, it is recommended to go to the hospital in time to avoid delaying the disease.