What are the symptoms of brain diseases?

The brain is divided into frontal lobe, parietal lobe, temporal lobe, occipital lobe and internal basal nucleus, etc. Damage to different parts will show different clinical symptoms. The main functions of frontal lobe are related to mental, language and voluntary movement. When frontal lobe shows damage, it may show orientation and disorientation; calculation ability is reduced; motor aphasia, that is, can understand but speech difficulties. Parietal lobe lesions may present sensory impairments in the limb opposite the lesion, and may also present as dyslexia. Temporal lobe lesions cause hearing, language, memory, and mental activity impairments. Language impairments often present as sensory aphasia, i.e., inability to understand speech but ability to speak. Occipital lobe lesions cause visual impairments, and clinically often present as dizziness, blurred vision, or visual impairment. The focal area of the basal ganglia is called the internal capsule, and its damage normally manifests as contralateral hemiplegia, hemiparesthesia, and hemianopia.