Progressive muscular atrophy

Progressive muscular atrophy (PMA) is a rare motor neuron disease that primarily affects the lower motor neurons — the nerve cells in the spinal cord that control your muscles. It is sometimes considered a variant or subtype of amyotrophic lateral sclerosis (ALS), though it has distinct features. In PMA, the lower motor neurons gradually break down and die, which means the muscles they control become weak and shrink over time, a process called muscle atrophy. The disease usually begins in adulthood and tends to start in the hands, arms, or legs. Early symptoms often include muscle weakness, twitching (called fasciculations), and muscle wasting, particularly in the limbs. Unlike classic ALS, PMA does not typically show prominent signs of upper motor neuron damage early on, such as stiffness or exaggerated reflexes, though some patients may develop these signs later. The disease is progressive, meaning symptoms worsen over time. There is currently no cure for progressive muscular atrophy. Treatment focuses on managing symptoms, maintaining function, and improving quality of life. Physical therapy, occupational therapy, and assistive devices can help people stay as independent as possible. Some doctors may prescribe riluzole, a medication approved for ALS, though its benefit in PMA specifically is not firmly established. Research is ongoing to better understand PMA and develop more effective treatments.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

Bring these to your next appointment

• Q1.Is my condition definitely PMA, or could it be ALS or another motor neuron disease?,What tests were done to rule out other conditions, and should genetic testing be considered?,How quickly is my disease likely to progress, and what signs should I watch for?,Would riluzole or any other medication be helpful in my case?,What therapies (physical, occupational, speech) should I start now?,Are there any clinical trials I might be eligible for?,When should I consider assistive devices or breathing support?

Common questions about Progressive muscular atrophy