What causes ALS - resources?
Last updated September 7, 2026.
**Most ALS has no known cause, but inherited gene changes cause some cases.** ALS, or amyotrophic lateral sclerosis, damages nerve cells that control your voluntary muscles. Most people who develop ALS have no known family history of it. If ALS runs in your family, a clinician or genetic counselor can explain what that means for you. Record any persistent changes in your strength, walking, or speech and discuss them with your clinician. MedlinePlus and the CDC offer information you can use to prepare for that conversation.
What to do
- **Start with reliable information:** Use MedlinePlus to learn about ALS symptoms, diagnosis, and care.
- **Record changes:** Write down when weakness or changes in walking, speech, or swallowing began.
- **Arrange an evaluation:** See your clinician if those changes persist or worsen.
- **Discuss family history:** Ask your clinician about genetic counseling if a relative has ALS.
- **Find support resources:** Visit the CDC National ALS Registry for research information and links to ALS support organizations.
Related questions
- Can i see what my doctor wrote about me
- How do i find out what my insurance covers
- How is als resources treated
- How long does als resources last