Spinal muscular atrophy (SMA)

Also called SMA

Spinal muscular atrophy (SMA) is a rare genetic condition that affects the nerves in the spinal cord that control muscles. This causes muscle weakness that can affect moving, breathing and swallowing. There are several types; the most severe starts in babies. It is inherited when both parents carry a faulty gene.

Last updated Nov 9, 2026

What it is

Newer treatments, such as gene therapy and medicines that boost a key protein, can slow or stop the condition, especially when given early.

Care also includes physiotherapy, help with breathing and feeding, and equipment to support movement.

Common signs

  • Floppy or weak muscles
  • Delayed movement milestones in babies
  • Difficulty breathing or coughing
  • Problems swallowing or feeding
  • A curved spine

How it is usually diagnosed

  • A genetic blood test
  • Newborn screening in some countries

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Genetic test results
  • Neuromuscular clinic letters
  • Treatment and infusion records
  • Breathing and therapy reports

Questions to ask your doctor

  • Which treatment is suitable for my child?
  • How will breathing and feeding be supported?
  • Should other family members be tested?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Breathing difficulties, a chest infection with fever, or problems swallowing: call 112

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

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