Ireland, particularly the north-west of the country, has the highest incidence of hereditary haemochromatosis in the world. Often dubbed the “Celtic Curse,” this genetic disorder leaves the body absorbing and storing too much iron. While the condition frequently remains asymptomatic in its early stages, the consequences of untreated iron overload are severe, potentially triggering liver disease, heart complications, and diabetes.
Tracing a Viking-Era Mutation
Haemochromatosis is passed from parent to child via a mutated gene. Dr. Paul Grant, a family doctor in Buncrana, Co Donegal, and medical adviser to the Irish Haemochromatosis Association of Ireland, notes that one in five people carries a single copy of the defective gene. Clinical iron overload can develop when an individual carries two copies of this mutation.
The origins of the condition are ancient. While it is believed the gene may have been brought to Ireland by Vikings, the gene has been identified in Neolithic remains discovered in north Antrim. It is thought that this trait may have conferred some benefit to the Vikings, enabling them to maintain good iron levels despite the limited diets of that era.
The Diagnostic Hurdle
In patients with haemochromatosis, iron is absorbed from the gut continuously, even when iron levels in the body are normal. This eventually leads to iron overload, where the body stores the metal in the liver, heart, pancreas, and joints.
Dr. Grant highlights that symptoms are frequently vague, leading to delayed diagnosis. Patients with haemochromatosis may experience the following symptoms:
- Fatigue
- Abdominal pain
- Joint pain and arthritis
- Palpitations
- Low libido
- Diabetes
Because these symptoms are not specific to haemochromatosis, they are often ignored, leading to delayed diagnosis and ongoing tissue damage.
Preventing Permanent Organ Damage
Left unmanaged, iron deposition creates a cascade of health failures. Excess iron in the liver triggers inflammation and scarring, potentially leading to cirrhosis and an increased tendency to develop hepatoma, a specific type of liver cancer. Cardiac involvement can manifest as cardiac arrhythmia or heart failure, while damage to the pancreas often results in diabetes.
Treatment and Public Awareness
Early diagnosis and treatment are the key to reducing complications. Dr. Grant emphasizes that once a diagnosis is made, treatment is relatively simple and further organ damage can be avoided.
Public awareness has improved significantly over the past 25 years, largely due to outreach efforts by the Irish Haemochromatosis Association. By encouraging awareness and easy access to necessary tests, medical professionals aim to ensure that individuals with the genetic predisposition can avoid the serious, long-term complications associated with the condition.