Right calf can not make strength, i.e. right calf weakness, may need to be considered when it is a sign of disease, such as acute cerebrovascular disease, intracranial tumors, incomplete spinal cord injury, lumbar intervertebral disc herniation, spinal cord cervical spondylosis and so on. 1. Acute cerebrovascular disease with unilateral lower limb weakness may be related to brain lesions, such as acute cerebral infarction, cerebral hemorrhage, etc., which may lead to impaired motor function of the limbs and weakness of the right calf. Besides, the patient may also be accompanied by cognitive, language and other functional impairments. 2. Intracranial tumor: when intracranial tumor damages the left motor center, it may also lead to right lower limb weakness. 3. Incomplete spinal cord injury: in this case, hypesthesia of the lower limbs and weakness of the limbs can occur. 4. Lumbar intervertebral disc herniation compressing the right nerve root: the patient may have numbness in the right lower limb, weakening of muscle strength, and may have the feeling of weakness in the lower limb. 5. Spinal cord neuropathy: this disease will compress or stimulate the spinal cord, also can appear lower limb sensory, motor, reflex disorder, can be manifested as the right lower limb muscle weakness, weakness. There are many diseases that can cause right calf weakness, the above is for reference only, when there is weakness in the right calf, it is recommended to consult a doctor in time, after a clear diagnosis to receive appropriate treatment.