Information About SMA
Spinal Muscular Atrophy (SMA) is a rare, genetically inherited neuromuscular condition. It causes progressive muscle weakness and loss of movement due to muscle wasting (atrophy).
There are different forms of SMA and a wide spectrum of how severely children and adults are affected. This section gives an overview of the most common form - 5q SMA - which includes SMA Types 1, 2, 3 and 4.
Gives a brief overview of 5q SMA - the most common form of SMA - and answers questions about this broad name, its causes, and how many people are affected.
Describes these in general terms for the different 'Types' or 'clinical classifications' of 5q SMA - Types 1, 2, 3 and 4.
Tells you how 5q SMA is inherited, how this can affect children and other relatives in a family, and what support and advice is available.
These pages explain more about the background behind recent changes in the clinical classification of SMA - moving more from 'Types' to 'milestones achieved'.