Spinal muscular atrophy (SMA) is a condition which affects the nerves in the spinal cord. This causes muscles in the body to get weaker over time. There are four types of SMA with SMA type 1 being the most common and most severe. Babies with SMA type 1 have weak muscles from birth and usually pass away in childhood. People with other types of SMA may need wheelchairs and breathing support. While there is no cure for SMA, new treatments are improving outcomes.
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