Myotonia is the resistance encountered when a muscle is passively stretched or pulled, or when a limb is moved passively or when a muscle is pulled. In short, it is a certain level of tension required for a muscle to maintain a specific posture. There is muscle tone in every person, and the muscle tension that can be detected at rest, such as sitting or lying down, without exerting force, is called muscle tone. Because the body has to maintain various postures and activities, muscle tone is needed. The production and maintenance of muscle tone is a complex reflex activity, and problems in any part of its reflex arc can cause changes in muscle tone. Muscle lesions can cause changes in muscle tone, abnormalities in neurons can cause changes in muscle tone, and there is also cerebral palsy and peripheral palsy that can cause changes in muscle tone. Some of these may manifest as high muscle tone and some as low muscle tone. For example, patients with myotonia or Parkinson’s can cause rigidity of movement, which is a sign of high muscle tone, while patients with epilepsy are unable to maintain their body posture during seizures and tend to fall down, which is a sign of low muscle tone. In conclusion, muscle tone is a force generated by the contraction of muscle cells with each other. The contraction of muscle cells is necessary to create muscle tone.