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We don't really know what causes ALS, but we do know that it can strike any adult at any time. While the usual age at onset is between 45 and 65, people as young as 17 have been diagnosed in the past. Between 5 and 10% of ALS cases are found in the same families, meaning that they are "familial", and are definitely linked genetically. But for the most part, diagnosis is sporadic and we don't know how it is caused.

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14y ago

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