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Please tell me what are the usual symptoms of spinal muscular atrophy?

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In brief: Weakness

Term implies a type of genetic disorder, which has several variations, and usually presents in early childhood.
It may present as a "floppy infant", but can also cause a progressive generalized symmetrical weakness and muscular atrophy, more proximal than distal. Difficulty swallowing and breathing may be seen late in the disorder.

In brief: Weakness

Term implies a type of genetic disorder, which has several variations, and usually presents in early childhood.
It may present as a "floppy infant", but can also cause a progressive generalized symmetrical weakness and muscular atrophy, more proximal than distal. Difficulty swallowing and breathing may be seen late in the disorder.
Thank