Amyotrophic lateral sclerosis

Amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's Disease, or Motor Neuron Disease (MND), is a rare and fatal degenerative neurological disease that affects a person's motor neurons, and is characterized by "increasing and spreading muscle weakness". https://www.merriam-webster.com/dictionary/amyotrophic%20lateral%20sclerosis#medicalDictionary