Huntington’s disease (HD) is a rare, inherited brain disorder. It slowly changes how a person moves, thinks, and feels. Usually symptoms occur in adult age, between the age of 30-50. They can occur both much earlier and much later in life. The symptoms worsen gradually over many years. HD is not contagious. It affects both men and women. If one parent has HD, each child has a 50% chance of inheriting the condition. HD can impact the whole family, not just the person with the condition.
Even though HD brings challenges, many people continue to live meaningful, active, and fulfilling lives for many years, supported by medical care, community resources, and strong personal relationships.
HD slowly damages cells in the brain. It affects the areas that help control movement, thinking, memory, behaviour, and emotions. As the disease progresses, more areas of the brain become affected, leading to increasing difficulty in daily life. This often impacts not only the person with HD but also family relationships and daily routines.
Huntington’s disease is caused by a mutation in the Huntington (HTT) gene, which everyone has as part of their normal DNA. In individuals with this condition, a specific part of this gene contains three letters of the genetic code – “C-A-G” – repeated more times than usual. These extra repeats cause brain cells to malfunction. We call this phenomenon gene expansion.
Genes come in pairs, and everyone has two copies of each gene. You inherit one from your father and the other from your mother. That is why there is a risk of 50% to inherit the disease from a parent with HD. The parent may pass either the mutated or the normal gene on to their offspring. Each individual child has the same chance or risk. There is no difference in the risk between women and men. The hereditary aspect of HD can cause a lot of stress, a sense of guilt, and other emotions within families.
People with HD start having symptoms at different ages. Most begin in their 30s to 50s, but some start earlier or much later. Even people in the same family can have very different predominant symptoms. One person may mostly have trouble moving, while for another, the most troublesome symptoms might be depressed mood or forgetfulness.Â
There are many reasons for those differences. It can be genetic factors, but it is also important to understand that lifestyle factors, such as eating healthy, exercising, and being socially active, can affect how symptoms affect you and your quality of life. Environmental factors can also play a role. Your financial and work situation, stress over time, etc., may influence how your brain can compensate and perform better in the long term. This can make it hard for families to know what to expect.
HD affects movement, thinking, and emotions. At first, someone might have minor problems, such as mood swings or trouble focusing. Over time, it becomes harder to walk, speak, swallow, or do everyday things. The symptoms get worse slowly, over many years. Family members often notice changes before the person with HD does.
Although there is still no effective treatment for the disease directly, many things can help. Regular exercise, healthy food, good sleep, routines, and emotional support all make a big difference. Doctors and therapists can help manage symptoms. It is important to seek help and treat symptoms like depression, anxiety, and sleep problems to keep the best possible quality of life.
Although the symptoms are caused by Huntington’s disease, it does not mean they should not be managed in the best possible way. Family, friends, and support groups can provide strength. Staying connected with others can reduce feelings of loneliness.
