Signs and symptoms of cerebral infarction in the left basal ganglia region are relatively mild, and hypertension causes small arteries to harden and occlude easily to form lacunar cerebral infarction in the basal ganglia region. If the patient’s internal capsule nerve is affected, it will lead to mild unfavorable movement of the right side of the limb and partial body sensory impairment. If the left basal ganglia area is damaged in the thalamic area, it will lead to the patient’s symptoms of right-sided limb numbness, which may manifest as clumsy speech and tongue extension deviation. The main causes of cerebral infarction in the left basal ganglia area of patients are hypertension, diabetes mellitus, hyperlipidemia, hyperhomocysteinemia, smoking, and alcohol consumption, which lead to atherosclerosis of the patient’s blood vessels and narrowing and occlusion of the lumen.