Juvenile-Onset MMD1

Signs and Symptoms

When MMD1 begins in early childhood (but not at birth), the first symptoms tend to be more behavioral and cognitive than physical. Some people with the juvenile-onset form struggle with planning ahead, decision-making and visual-spatial processing. An "avoidant" or apathetic personality can be part of the picture.

As the child matures into adulthood, typical features of adult-onset MMD1 usually emerge.

To learn more about the juveile-onset form of MMD1, be sure to read Juvenile-Onset MMD1 Can Cause Cognitive, Behavior Challenges (part of Quest's In Focus: Myotonic Muscualr Dystrophy series).