I am getting quite concerned with my health. About 8 months ago, I started having these weird/strange muscle problems. If feels like my muscles all over my body vibrate. Not for long periods just a quick vibration of the muscle. Mostly in my legs and arms. My legs feel heavy most of the time. Noticed a difference when I do the treadmill. Very fatigued. What are the symptoms of ALS? The neuro did mention this to me, which has me very concerned. Did have an MRI of the brain, showed multiple lesions but they dont think its MS. Any info would be greatly appreciated. I know nothing about this disease. Is is always fatal?