MND
Types of Motor Neurone Disease
MND is an umbrella term covering several related conditions, including ALS. A clear guide to the main types, the ALS naming, and why progression varies so much.
Last updated 23 May 2026 · How we research
"Motor neurone disease" is an umbrella term covering several related conditions that all involve the loss of the motor neurones controlling movement. They differ in which nerves are affected first and in how quickly they progress. This is general information rather than medical guidance; a specialist is needed for any individual diagnosis.
The main types
The most common form is amyotrophic lateral sclerosis (ALS), which affects both the upper motor neurones in the brain and the lower motor neurones in the spinal cord. Progressive bulbar palsy chiefly affects the nerves controlling speech and swallowing, so its first signs often involve the voice. Progressive muscular atrophy mainly affects the lower motor neurones and tends to progress more slowly. Primary lateral sclerosis affects the upper motor neurones and is usually the slowest-progressing form of all. In practice the types can overlap, and one can evolve into another.
A note on the name
The terminology causes a lot of confusion. In the United Kingdom and much of the world, "motor neurone disease" is the umbrella term and ALS is one type within it. In the United States, "ALS" is often used as the umbrella term for the whole group, and it is also widely known there as "Lou Gehrig's disease," after the baseball player who died of it. They are describing the same family of conditions.
Why progression varies
How quickly MND advances differs enormously between individuals and between types, which is one reason a diagnosis cannot give a precise timeline. Most forms progress over a few years, but some, especially primary lateral sclerosis and certain rare early-onset cases, advance far more slowly. Hawking's own disease, which he lived with for fifty-five years, was an extremely rare, slowly progressing, early-onset form, and his survival remains exceptional and not fully explained. His longevity is the great outlier, not the norm, but it stands as a reminder of how varied the disease can be.
If you or someone close to you is affected by MND, the MND Association offers information and support. You can find ways to help on the support page.