**Thomsen myotonia** began to be called a disease that is expressed in slow voluntary movements of the hands, fingers and small muscles of the face. This disease is named after the Danish professor of anatomy Axel Thomas Thomssen (1877-1959). The term "myotonic syndrome" was introduced in 1928 by the German physician Hans Rudolf Engel.
Researchers explain the development of a particular syndrome by genetic factors. If there is a predisposition in the ACVR1 gene, myotonic myotonia occurs. A boy is 3 times more likely to get the disease than a girl living with a carrier. The syndrome will definitely pass through 2-3 generations of descendants. Parents and their siblings of children are not born with this disease. With each generation, heredity will be less and less expressed. Genetic characteristics are not directly related to the development of the disease. There are no oncogenic properties for sick and healthy people. This syndrome does not apply to malignant diseases. In particular, brain tumors cannot develop due to myotonic syndrome