NFL great Dwight Clark says he has ALS, suspects football a cause

SAN FRANCISCO — Dwight Clark revealed Sunday that he has Lou Gehrig’s disease and suspects playing football might have caused the illness.

Clark announced on Twitter that he has amyotrophic lateral sclerosis, a disease that attacks cells that control muscles. The former San Francisco 49ers wide receiver linked to a post on his personal blog detailing his ALS diagnosis, but the site crashed Sunday night, apparently from an overflow of traffic.

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