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Mental Health Center

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Dementia in Amyotrophic Lateral Sclerosis (ALS)

Symptoms of Dementia in ALS

Fronto-temporal dementia-like symptoms in ALS usually appear as a change in personality and behavior. The exact nature of this change varies from person to person. The following symptoms are common:

  • Apathy (lack of interest, withdrawal)
  • Lack of emotion
  • Reduced spontaneity
  • Loss of inhibition
  • Restlessness or overactivity
  • Social inappropriateness
  • Mood swings

Cognitive symptoms include the following:

  • Memory loss
  • Loss of speech and/or language comprehension, partial or complete
  • Loss of reasoning or problem-solving ability

Some individuals develop repetitive rituals involving hoarding, dressing, wandering, or using the bathroom. Others may overeat or develop strange eating rituals.

Cognitive changes can precede, follow, or coincide with the movement symptoms of ALS. Throughout the course of the dementia, the following typical signs and symptoms of ALS also progress:

When to Seek Medical Care for ALS

You are the best person to judge whether you are experiencing changes that suggest ALS and dementia. Because dementia is not a common feature associated with ALS, and can have many causes, it is important to see your health care provider if you develop any changes in personality, behavior, language comprehension, or memory.

Exams and Tests for ALS and Dementia

Changes in personality, behavior, or cognitive functions have many different causes. The causes vary by age, sex, and various other factors. Your health care provider will have the difficult job of sorting out all the possible different causes of your symptoms. He or she will ask many questions, perform exams, and conduct tests to try to pinpoint the cause.

The medical interview will include questions about your symptoms and how they started, your medical problems now and in the past, your family members' medical problems, your medications, your habits and lifestyle, and your work, military, and travel history. The physical exam will focus on neurological signs of ALS and other disorders that can cause similar symptoms. It will also include tests of mental status, such as answering questions and following simple directions. Because depression is also common in ALS, the medical interview will include an evaluation for depression.

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