My nephew has this. He is 35 years old with 3 children, 11, 9, and 5. He won't see them grow up. No one in our families has ever had this that we are aware of. He was diagnosed with this in Feb, 2006. Just one month after we watched my Mom (his grandma) die of colon cancer. Now we have to watch him go through this. He can talk but is very difficult to understand. He can stand but can no longer walk. He had to be fed now. He needs help to go to the bathroom. He cannot be by himself anymore. Someone must be with him 24/7 now. He now lives in a handicapped apartment. There are many different theories on what causes it but no one knows for sure. His doctor said plumbers, firefighters, and people in the military seem to get it at a higher rate than everyone else. Well he was a plumber and did work at military bases.
There is walk to D'Feet, a fundraiser for ALS held in cities each year. See my link below. My nephews team is The Flying Chipmunks.