Does SMA Only Affect Muscles?
The disease begins with a shortage of survival motor neuron, or SMN, protein, which causes motor neurons in the spinal cord and brainstem to become damaged and die. Those motor neurons control voluntary muscle movement, so muscle weakness, muscle atrophy, difficulty walking, reduced head control, and loss of mobility are among the most visible effects. However, SMA can also influence breathing, swallowing, posture, bone health, nutrition, fatigue, and other parts of daily function. Cure SMA’s standards of care address respiratory, gastrointestinal, nutritional, musculoskeletal, and other organ-system concerns because SMA can create health challenges far beyond muscle strength alone.
Researchers are also learning that low SMN protein may have effects throughout the body because SMN protein is produced in many different tissues, not only motor neurons. At the 2026 Annual SMA Research & Clinical Care Meeting, experts discussed SMA as an increasingly recognized whole-body condition, including emerging evidence involving metabolism, the liver, gastrointestinal health, and other systems. People with SMA may experience respiratory weakness, swallowing difficulties, constipation or reflux, scoliosis, reduced bone density, fatigue, and complications related to reduced mobility. These effects can vary widely depending on SMA type, age, disease severity, treatment history, and individual health, so not every person with SMA will experience the same combination of complications.
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