How Progressive is SMA?
SMA affects the motor neurons in the spinal cord, which are the nerve cells responsible for sending signals from the brain to the muscles. When those motor neurons are damaged or lost, the muscles can gradually weaken, shrink, and become harder to use for movement, posture, breathing, swallowing, and daily independence. The National Institute of Neurological Disorders and Stroke explains that low levels of survival motor neuron protein lead to the loss of motor neurons in the spinal cord, causing weakness and wasting of skeletal muscles.
Some forms of SMA begin before birth or in infancy and may progress quickly, affecting breathing, feeding, and early motor milestones. Other forms appear later in childhood, adolescence, or adulthood and may progress more slowly, causing changes in walking, arm strength, fatigue, posture, respiratory function, and independence over time. SMA types are commonly described by age of onset and physical milestones, while the condition can vary widely from person to person. This means progression is not always the same path for everyone; two people with the same SMA type may still experience different levels of strength, mobility, support needs, and quality of life.
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