Dwight Clark’s announcement Sunday night that he has been diagnosed with ALS surprised many 49ers fans — who may be wondering what the condition entails.
Here’s a deeper look at ALS, with background information gleaned from the ALS Association website and a Bay Area News Group feature on the disease.
How ALS affects afflicted
It severely hinders motor function, making such activities as moving, eating and breathing difficult.
The degenerative affliction is a progressive weakening of the muscles caused by nerve degeneration. Early symptoms include weakness in the arms or legs, slurred speech and trouble chewing and swallowing.