The inflexibility of the patient’s left hand is mainly related to cervical spondylosis, cerebrovascular disease, and peripheral nerve entrapment. Therefore, if left hand inflexibility occurs, it is necessary to actively conduct relevant examinations and then carry out targeted treatment: 1. If left hand inflexibility occurs gradually, it may be associated with cervical spondylosis compression of spinal nerve roots resulting in left hand pain, decreased muscle strength and left hand inflexibility. The left ulnar nerve may be compressed and the interosseous muscles of the hand atrophied, resulting in weakness and inflexibility. 2. The inflexibility of the limbs can also be diagnosed by CT and MRI of the head.