# Types of Spinal Muscular Atrophy (SMA)
Keywords: spinal muscular atrophy, SMA types, muscle weakness, SMA symptoms, SMA characteristics

> This page provides an overview of the types of spinal muscular atrophy (SMA), their symptoms, and characteristics. It explains how SMA is classified, its signs, and the differences in severity and onset across various types.

## Details
- [Types of SMA](#): SMA is categorized by age of onset and functional ability, with varying severity within each type.
- [Signs and Symptoms of SMA](#): Symptoms include progressive muscle weakness, floppiness, and muscle wasting, often symmetrical across the body.
- [Characteristics of SMA](#): Overview of the defining traits of SMA, with additional details available for each type.
- [SMA in Infants & Children](#): Focuses on the presentation and impact of SMA in younger patients.
- [SMA in Adults](#): Discusses how SMA manifests and affects adult patients.
- [References](#): Lists scientific studies and resources related to SMA for further reading.