Huntington's is a progressive disease. Once the symptoms appear, they continue and worsen over time. In most cases, they become noticeable between the ages of 30 and 50 and typically begin gradually. Although their onset and progression can vary from person to person, they fall into three basic categories.
After Huntington's disease starts, a person's functional abilities gradually worsen over time. The rate of disease progression and duration varies. The time from the first symptoms to death is often about 10 to 30 years. Juvenile Huntington's disease usually results in death within 10 years after symptoms develop.
People can start to show the symptoms of Huntington's disease at almost any age. Most will develop problems between the ages of 30 and 50. The condition gradually gets worse for around 10-25 years, until the person dies.
From the onset of symptoms, people with HD have a life expectancy of 10 to 25 years. HD is not evident at birth. In fact, symptoms will usually not appear until a person is between 35 and 55 years of age, and occasionally even later in life.
Huntington's disease is a condition that stops parts of the brain working properly over time. It's passed on (inherited) from a person's parents. It gets gradually worse over time and is usually fatal after a period of up to 20 years.
Nine patients have died, and seven have been lost to follow up. The range of disease duration was between 2 and 17 years, the oldest living to age 91.
The most painful conditions in Huntington's, said Achterberg, are limb pain, headache, abdominal pain and fractures. “I think we should do more work in validation of pain tools, including observational pain instruments,” he said. “And for clinicians, I suggest you be especially aware of abdominal pain.”
Pneumonia and heart disease are the two leading causes of death for people with HD.
The disease gets worse over time. Early signs of HD can vary, but often include mild clumsiness or problems with balance or movement, cognitive or psychiatric symptoms (problems with thinking or emotion), and changes in behavior.
This disease often affects a person's ability to plan, make decisions, and process complex topics. But patients usually retain past memories, and are able to recognize people, objects, letters, numbers, and colors. They are often able to continue carrying out jobs that they have previously been doing for many years.
No treatments can alter the course of Huntington's disease. But medications can lessen some symptoms of movement and psychiatric disorders. And multiple interventions can help a person adapt to changes in abilities for a certain amount of time.
Early symptoms
The first symptoms of Huntington's disease often include: difficulty concentrating. memory lapses. depression – including low mood, a lack of interest in things, and feelings of hopelessness.
While the cause of the disease is known — a single mutated gene — there is no cure. “Our plan is to conduct human clinical trials that deliver stem cells to replace damaged brain cells, reducing levels of harmful proteins that build up in the brains of Huntington's disease patients.”
For the purpose of this fact sheet, the beginning of end-of-life in HD is determined as the stage when the person affected has little control over movement, is bedbound, unable to communicate, unable to eat and drink on his/her own and experiences severe chorea or extreme rigidity.
Hospice referrals for Huntington's can be challenging because it's difficult to predict decline. Common end-of-life signals include significant weight loss, difficulty swallowing or breathing, recurrent aspiration pneumonia, and uncontrolled pain.
People with Huntington's disease usually die within 15 to 20 years of their diagnosis. The most common causes of death are infections (such as pneumonia) and injuries related to falls.
Huntington disease affects an estimated 3 to 7 per 100,000 people of European ancestry. The disorder appears to be less common in some other populations, including people of Japanese, Chinese, and African descent.
Many people with Huntington's disease report that their sleep patterns are affected and sometimes are awake most of the night, then continually catnap or doze throughout the day. Many find themselves experiencing long periods being awake or asleep.
When alcohol becomes a coping mechanism for Huntington's disease, that's when it becomes a problem. “With any neurodegenerative or medical disease, drinking a lot can certainly affect your balance and your gait,” says Dr. Oguh.
There have been reports that juvenile onset Huntington's chorea is almost always inherited from the father, and that late-onset Huntington's chorea is inherited more often from the mother than from the father.
Symptoms of Huntington's disease usually develop between ages 30 and 50, but they can appear as early as age 2 or as late as 80. The hallmark symptom of Huntington's disease is uncontrolled movement of the arms, legs, head, face and upper body.
It's possible to develop HD even if there are no known family members with the condition. Around 10% of people with HD don't have a family history. Sometimes, that's because a parent or grandparent was wrongly diagnosed with another condition like Parkinson's disease, when in fact they had HD.
Huntington's disease does not skip generations. Each child of a parent with Huntington's has a 50% chance of inheriting the defective gene. If a child does not inherit the gene, he or she cannot pass it on. If the child does inherit the gene, he or she can pass it on and will develop the disease.