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What happens to the body when you have spinal muscular atrophy?

Author

William Cox

Published Feb 19, 2026

What happens to the body when you have spinal muscular atrophy?

Spinal muscular atrophy (SMA) is a group of hereditary diseases that progressively destroys motor neurons—nerve cells in the brain stem and spinal cord that control essential skeletal muscle activity such as speaking, walking, breathing, and swallowing, leading to muscle weakness and atrophy.

Consequently, who does spinal muscular atrophy affect most?

The primary symptom of chromosome 5-related (SMN-related) SMA is weakness of the voluntary muscles. The muscles most affected are those closest to the center of the body, such as those of the shoulders, hips, thighs, and upper back.

One may also ask, can spinal muscular atrophy cause of death? Spinal muscular atrophy (SMA) is a rare neuromuscular disorder that results in the loss of motor neurons and progressive muscle wasting. It is usually diagnosed in infancy or early childhood and if left untreated it is the most common genetic cause of infant death.

Spinal muscular atrophy
Frequency1 in 10,000 people

In this way, does spinal muscular atrophy get worse with age?

Symptoms usually begin after age 35 and slowly get worse over time. Because it develops slowly, many people with type IV SMA don't know that they have it until years after symptoms begin.

What is the life expectancy of someone with SMA?

Overall, about 68% of children with SMA type 1 die before their second birthday and 82% die before their fourth, but survival in these infants is improving with improvements in respiratory and nutritional care.

Is spinal muscular atrophy more common in males or females?

Males are more commonly affected with SMA than females are. The male-to-female ratio is 2:1. The clinical course in males is more severe.

What age is spinal muscular atrophy diagnosed?

Symptoms usually appear around 18 months of age or in early childhood. Children with this type of SMA generally have an almost normal life expectancy.

Is spinal muscular atrophy painful?

Overall, pain in this population of SMA patients appears to be comparable to that of people with osteoarthritis or chronic low back pain. Despite SMA patients being generally protected from severe pain, younger SMA patients do experience pain at heightened rates.

Is spinal muscular atrophy a disability?

Spinal muscular atrophy (SMA) is a debilitating disease that can be classified as a disability if symptoms are severe enough to cause significant impairments. SMA is hereditary and progressive, affecting both the central and peripheral nervous systems as well as voluntary muscle function.

Does SMA run in families?

Most people have two copies of the SM1 gene - one from each parent. SMA normally only happens when both copies have the gene change. If only one copy has the change, there usually aren't any symptoms. But that gene could be passed down from parent to child.

What are signs of muscle weakness?

Muscle weakness may accompany other symptoms affecting the muscles including:
  • Burning feeling.
  • Frequent episodes of falling.
  • Loss of muscle coordination.
  • Muscle spasms.
  • Pain.
  • Paralysis.
  • Pins-and-needles (prickling) sensation.
  • Twitching.

Do both parents have to carry the gene for SMA?

An individual must inherit two non-functioning SMA genes – one from each parent – to have symptoms of SMA. If both parents are carriers there is a one in four (25 percent) chance that both will pass on the non-functioning gene, which would result in a pregnancy affected with spinal muscular atrophy.

Does SMA affect intelligence?

SMA in infancy and early childhood is associated with worse outcomes, while patients who develop symptoms later in childhood or in adolescence usually have a more positive prognosis. SMA does not affect sensory nerves or intellect, but it has been observed that many patients with SMA are highly intelligent.

Does SMA affect the heart?

In patients with SMA, tissue levels of SMN1 protein are reduced in heart tissues,3 and numerous mouse models of SMA exhibit cardiac developmental abnormalities which together suggest that low SMN1 protein is a possible risk factor and potential cause of heart defects.

Is Spinal Muscular Atrophy inherited?

Spinal muscular atrophy is inherited in an autosomal recessive pattern , which means both copies of the SMN1 gene in each cell have mutations.

Which is the most expensive medicine in the world?

The most recent treatment is Zolgensma (generic name onasemnogene abeparvovec), a pioneering gene therapy dubbed “the most expensive drug in the world†and only available through the NHS since March 2021. Zolgensma uses a harmless virus with some of its DNA replaced by a copy of the human SMN1 gene.

Can Spinal Muscular Atrophy be detected pregnancy?

If you're pregnant and there's a risk you could have a child with SMA, tests can be carried out to check for the condition. The 2 main tests are: chorionic villus sampling (CVS) – a sample of cells from the placenta are tested, usually during weeks 11 to 14 of pregnancy.

Does spinal muscular atrophy affect the brain?

Spinal muscular atrophies are usually inherited as an autosomal (not sex-linked) recessive trait. That is, two genes for the disorder are required, one from each parent. These disorders may affect the brain and spinal cord (central nervous system), as well as peripheral nerves.

How is muscle atrophy prevented?

Preventing muscle atrophy requires both exercise and proper nutrition. Exercise while ignoring nutrition is counterproductive. As we exercise, our bodies burn calories and consume nutrients at a higher rate.

How is spinal atrophy treated?

Spinal Muscular Atrophy Treatment. The FDA has approved three medications to treat SMA: nusinersen (Spinraza), onasemnogene abeparvovec-xioi (Zolgensma) and risdiplam (Evrysdi). Both are forms of gene therapy that affect the genes involved in SMA.

Can SMA be prevented?

No, SMA cannot be prevented and there is no cure.

Is Spinal muscular atrophy the same as muscular dystrophy?

A Word From Verywell. While muscular dystrophy can cause muscle atrophy, they are not the same condition. Muscular dystrophy is a genetic condition encompassing nine main types, while muscle atrophy refers to the loss of muscle tissue. Muscle atrophy can often be reversed with treatments and exercise.

How do you diagnose spinal muscular atrophy?

genetic blood tests, which can confirm the diagnosis of SMA. an electromyography (EMG) test that measures the electrical activity of a muscle or a group of muscles (in some cases) a creatine kinase (CPK) test (to distinguish from other types of neuromuscular diseases, if necessary)

How is SMA caused?

What causes SMA? The most common form of SMA is caused by defects in both copies of the survival motor neuron 1 gene (SMN1) on chromosome 5q. This gene produces the survival motor neuron (SMN) protein which maintains the health and normal function of motor neurons.

Is muscle atrophy serious?

Because muscle atrophy can be due to serious diseases, failure to seek treatment can result in serious complications and permanent damage.

How many babies are born with spinal muscular atrophy?

One in every 6,000 babies is born with SMA. It occurs in both males and females of all races, and can begin in infancy, childhood, or adulthood, three of which affect children.

Is Spinal Muscular Atrophy Type 2 progressive?

Spinal muscular atrophy type 2 (SMA2) is a genetic neuromuscular disorder that affects the nerve cells that control voluntary muscles (motor neurons). Without treatment, progressive muscle weakness develops in babies with SMA2 between ages 6 and 12 months.

Is SMA type 2 progressive?

Spinal muscular atrophy type 2 (SMA2) is a genetic neuromuscular disorder that affects the nerve cells that control voluntary muscles (motor neurons). Without treatment, progressive muscle weakness develops in babies with SMA2 between ages 6 and 12 months.

Does folic acid prevent SMA?

Penn Study Finds Signs Folic Acid And Vitamin B12 May Lessen Some Ill Effects Of SMA. Summary: Scientists have found evidence suggesting that the severity of spinal muscular atrophy (SMA) may be ameliorated by common vitamins.

Does Spinraza increase life expectancy?

Symptoms generally appear between 6 to 18 months after birth. Most patients will survive past the age of 25, with life expectancy improved by aggressive supportive care.

Is SMA a rare disease?

Approximately 10,000 to 25,000 children and adults are living with SMA in the United States. It's a rare disease that affects one out of 6,000 to 10,000 children.

Can SMA type 2 be cured?

There's currently no cure for SMA, but the Food and Drug Administration (FDA) has recently approved several new treatments for both type 1 and type 2 SMA, including innovative gene therapies, with many more potential treatments on the horizon.

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