Thomsen disease is inherited in an autosomal dominant pattern , which means one copy of the altered gene in each cell is sufficient to cause the disorder. In most cases, an affected person has one parent with the condition.
How common is myotonia congenita?
Myotonia congenita is estimated to affect 1 in 100,000 people worldwide.
Does myotonia congenita get worse with age?
Though myotonia congenita starts in childhood, it usually doesn’t get worse over time. You or your child should be able to lead a normal, active life with this condition. The muscle stiffness can affect movements like walking, chewing, and swallowing, but exercise and medicine can help.