What Really Causes Aphasia?

11. Progressive Neurological Diseases

Conditions like ALS (Lou Gehrig’s disease) or MS don’t always start with language problems. But as they progress, they can begin to interfere with how the brain sends and processes messages—including speech and comprehension.

You might start to notice slower speech, trouble forming words, or increasing pauses in conversation. Some people struggle more with writing or following conversations, especially in noisy environments or when they’re tired.

Because these diseases affect different parts of the nervous system over time, the communication challenges tend to evolve too. That can make it harder to recognize as aphasia at first—but the impact is just as real.