The lack of strength in hemiplegic patients may be caused by hemiplegia itself, or it may be caused by systemic diseases. 1. Hemiplegia itself, such as cerebral infarction, cerebral hemorrhage, brain tumor and other diseases, can cause damage to the motor center, which in turn causes paralysis of the hemiplegic side of the limbs and limb weakness. 2. Systemic diseases, if the limbs other than the hemiplegic side limbs also have no strength, it may be caused by other systemic diseases, such as hypokalemia, diabetes mellitus, cardiac insufficiency, pulmonary diseases and long-term bed rest. The lack of strength in hemiplegic patients may be caused by the hemiplegia itself or by other reasons. It is recommended to go to the neurology department to clarify the cause of the lack of strength and give targeted treatment.