Symptoms of SMA

The primary symptom of SMA is weakness of the voluntary muscles. The muscles most affected are those closest to the center of the body, such as those of the shoulders, hips, thighs and upper back. The lower limbs seem to be affected more than the upper limbs, and deep tendon reflexes are decreased.

Comprehensive, multidisciplinary care for SMA addresses the full range of symptoms, including:

  • Muscle weakness and decreased muscle tone
  • Limited mobility
  • Breathing problems
  • Problems eating and swallowing
  • Delayed gross motor skills
  • Spontaneous tongue movements
  • Scoliosis (curvature of the spine)

Onset of SMA symptoms is determined by the type of SMA.