Is amyotrophic lateral sclerosis a type of multiple sclerosis (ms)?

Not similar diseases. Als is very different, and is a disease of "mis-folded proteins" like alzheimers and parkinson's, and all of these affect older people. Ms is an autoimmune disease afflicting younger patients who have hereditary susceptibilities and environmental exposures. Ms can be successfully treated and controlled, but ALS does not respond well to current therapies.