Increased myotonia is a relatively common neurological symptom and sign in clinical practice. Myotonia is the basis for maintaining body posture, as well as normal movement, and is expressed in various forms, with resting myotonia in the resting position, and actually trunk muscles contracting all the time when the torso is standing, called motor myotonia, which can ensure smoothness and continuity of movement. Therefore, when myotonia is increased, the main clinical manifestations are the following: first, it can lead to abnormal posture, the normal posture is maintained in the process of coordination, myotonia will lead to the destruction of coordination, the most common is crossed legs, often caused by the two lower limbs of the adductor muscle hypertonia, resulting in two legs crossed, also known as scissor legs and so on. The second is the persistence of hypertonia, causing continuous muscle contraction, most commonly clinical twitching, commonly seen in infants and children with brain disorders resulting in regional brain tonicity, or sometimes seen in seizures with flexor muscle spasms, and continuous twitching. Thirdly, there is an incongruity between muscle tone. In normal movement, when the flexor muscle contracts, the extensor muscle should stretch in order to complete the whole movement, and the incongruity of muscle tone will lead to an imbalance in the tension of flexion and extension, resulting in tardive dyskinesia, or special movements such as pole-like or gear-like. If you have this kind of symptoms, you should go to neurology or orthopedics for a clear diagnosis and consultation as soon as possible.