The stiffness of the tibialis anterior muscle may be caused by the following conditions: first, nerve problems, because the function of the nerve is mainly to conduct sensation and control the contraction and diastolic movement of the muscle, if there is a problem with the common tibial nerve or the anterior cervical nerve that innervates the tibialis anterior muscle, it will cause the nerve to be unable to properly conduct sensation, which will also produce muscle stiffness. Second, it may be due to muscle lesions, such as muscular atrophy or muscle dystrophy, when there is muscular atrophy or muscle dystrophy, these muscles can not properly complete the physiological activities, such as contraction and diastolic movement, and at the same time, because the muscle lesion itself, the muscle can not feel the external stimulation, also can not accept the innervation, also will produce muscle stiffness. The same sensation of muscle stiffness can occur.