Currently, a modified version of the Ashworth scale is usually used in clinical practice, where the speed of movement is the completion of joint movement in 1 second, and the muscle tone is graded according to the resistance to passive movement of the joint. According to this scale, muscle tone can be classified into 5 grades: 1, grade 0: no increase in muscle tone; 2, grade 1: a slight increase in muscle tone, with the affected part showing minimal resistance or appearing suddenly stuck and released at the end of the joint range of motion during passive flexion and extension. 1+ grade, a mild increase in muscle tone, with sudden stuckness in the latter 50% of the joint range of motion and minimal resistance in the latter 50% of both joint ranges of motion; 3 Grade 2: more marked increase in myotonia through most of the joint range of motion, but the involved part can still be moved relatively easily; Grade 4, 3: severe increase in myotonia, with difficulty in passive movement; Grade 5, 4: tonicity, with the involved part showing stiffness in passive flexion and extension and inability to move. After the determination of muscle tone by the doctor, patients with abnormal muscle tone are recommended to improve the CT or MRI of the head and neck to investigate the brain or spinal cord in order to detect the cause and then treat it.