When the body is weak after cerebral infarction, a detailed medical history should be taken, the cause should be analyzed, and appropriate treatment should be given for different causes. If patients present with unilateral or lateral limb weakness, most of them are considered to be caused by cerebral infarction itself, and they should mainly be given rehabilitation, acupuncture treatment, and active treatment of the primary cerebral infarction, as well as control of risk factors. In general, it is mainly seen in patients with large hemispheric infarcts, cerebral infarcts in the basal ganglia area and lacunar infarcts. In the case of generalized weakness, it may be due to other causes, which commonly include hypokalemia. In patients with large hemispheric infarcts, there is usually cerebral edema and increased intracranial pressure, and cranial pressure-lowering therapy is often applied clinically, with the main drugs being mannitol and tachypnea. Mannitol and tachypnea are prone to cause hypokalemia during application. If patients develop general weakness during treatment, electrolytes should be monitored promptly and low blood potassium should be corrected promptly, either by intravenous potassium supplementation or oral potassium supplementation therapy to prevent cardiac arrest caused by severe hypokalemia.