May is Huntington Disease Awareness month

May is Huntington Disease Awareness month.

What is Huntington Disease?

From Huntington Society Canada – click HERE to learn contact them directly

Huntington disease (HD) is a hereditary, neurodegenerative illness with physical, cognitive and emotional symptoms. Huntington disease is caused by a mutation in the gene that makes the protein called huntingtin. In people with HD, the CAG sequence is repeated too many times at the beginning of the gene. That causes cells to manufacture a harmful protein called mutant huntingtin. The mutant huntingtin protein causes certain parts of the brain to die – specifically the caudate, the putamen and, as the disease progresses, the cerebral cortex. As the brain cells die, symptoms will appear in each of the three components (physical, cognitive and emotional).

To date, there are no drugs to slow or stop the progression of Huntington disease; however, there are specific drugs available to reduce some of the symptoms. Research is being conducted in Canada and globally to find promising treatments and approaches to treating HD.


Huntington disease is a genetic disorder. The HD gene is dominant, which means that each child of a parent with HD has a 50% chance of inheriting the disease and is said to be at-risk. Males and females have the same risk of inheriting the disease. HD occurs in all races. Symptoms usually appear between the ages of 35 and 55, but the disease can appear in youth (under 20 years – Juvenile HD) or older adults (Late Onset HD).


Symptoms vary from person to person and at different stages of the disease.

  • Physical symptoms: weight loss, involuntary movements (chorea), diminished coordination, difficulty walking, talking and swallowing
  • Cognitive symptoms: difficulty with focus, planning, recall of information and making decisions; impaired insight
  • Emotional symptoms: depression, apathy, irritability, anxiety, obsessive behaviour

Early Stages of HD

At this stage, people with HD can function quite well at work and at home. Early symptoms of the disease may include the following:

  • Difficulty organizing routine matters or coping effectively with new situations
  • Decreased ability to recall information and make decisions
  • Increased difficulty with work activities
  • Decreased attention to details
  • Mood changes and irritability
  • Minor involuntary movements (e.g. “nervous” activity, fidgeting, a twitching of the limbs or excessive restlessness)
  • Changes in handwriting or difficulty with daily tasks such as driving


People with HD in the intermediate stage may have increasing difficulty working or managing a household but can still deal with most activities of daily living. Symptoms progress over time and may include the following:

  • More obvious involuntary movements (chorea)
  • Increased difficulty with walking, coordination and balance
  • Challenges with speaking (speech may become slurred) and delays in thinking process
  • Solving problems becomes more difficult
  • Difficulties with swallowing
  • Weight loss


People in the advanced stages of HD can no longer manage the activities of daily living and usually require professional care. Symptoms will include the following:

  • Decrease in involuntary movements and increase in rigidity
  • Increased difficulties with swallowing
  • The ability to communicate diminishes, but understanding what is being said remains possible
  • Significant weight loss

Contact Huntington Disease Canada for more information.