Sleepy arms and lack of strength are commonly caused by muscle strain or cold, severe cervical spondylosis, degenerative joint changes, etc., as follows: First, muscle strain or cold: muscle strain or cold in the upper limbs can lead to excessive muscle and fascia tension, local stiffness and restricted movement, and the patient will show symptoms of upper limb weakness, and the symptoms will be relieved after hot compresses and rest. Second, severe cervical spondylosis: patients with severe cervical spondylosis can lead to weakness of one upper limb arm, accompanied by muscle tension, cervical spine pain and activity limitation is more common, MRI can find cervical disc herniation. Third, degenerative joint changes: degenerative changes occur in the joints of the upper limbs, such as the elbow joint, forming osteoarthritis, and the patient will show stiffness of the joints, limited joint activities, and reduced strength of the upper limbs. If treated promptly, the symptoms can be corrected. If the best time for treatment is missed, significant atrophy of the upper limb muscles can occur.