Cerebral infarction may cause patients to have symptoms of weakness. Infarction in the cerebellum or brainstem or medulla oblongata may cause patients to have severe dizziness, nausea, vomiting and other symptoms, causing patients to have weakness. If the infarction is in other parts of the brain, it does not cause dizziness and does not make the patient feel weak. If the infarct site of the patient is in the internal capsule, it will cause the patient to have symptoms of unfavorable movement of the contralateral limb, clumsy speech and numbness of the limb, which will not cause the patient to have malaise. If the patient has weakness, it is not caused by dizziness, but by other factors, such as whether the patient is combined with hyperglycemia or blood viscosity.