Tiredness that sleep does not fix. Sore knuckles. A bit of brain fog. Turning fifty and feeling, as one Irish patient put it, like someone let the air out of you. It is the sort of cluster that gets waved through as “just getting older”, and in most cases that is exactly what it is. But in Ireland, more than anywhere else on earth, it is worth asking one extra question: has anyone ever checked your iron?
Not for deficiency. For the opposite.
TL;DR
- Hereditary haemochromatosis, the “Celtic gene”, makes the body absorb too much iron from food. Ireland has the highest reported rate in the world: roughly 1 in 83 people carry the at-risk genotype and about 1 in 5 carry a single copy.
- A February 2026 study in Nature Communications mapped the risk and found the Northwest Irish group, spanning Northern Ireland and northern counties from Mayo to Meath to Donegal, has the highest frequency anywhere in these islands at 1 in 54.
- It usually declares itself between 30 and 60, and later in women, because monthly blood loss is protective until menopause. That makes the years either side of 50 the classic window.
- Diagnosis starts with two ordinary blood tests (transferrin saturation and ferritin), followed by an HFE gene test. Treatment is venesection: removing blood, first weekly, then two to four times a year for life.
- Treated before organ damage, life expectancy is normal. Left alone, iron accumulates in the liver, heart, pancreas and joints.
What the condition actually does
Your body has no efficient way of getting rid of surplus iron. Absorption is therefore tightly rationed at the gut wall. In hereditary haemochromatosis, a fault in the HFE gene disables that rationing, so iron keeps arriving and keeps being stored, year after year, in the liver, heart, pancreas, pituitary and joints. The damage is slow and silent, which is precisely the problem: by the time it announces itself loudly, some of it may be permanent.
It is inherited recessively. You need a faulty copy from each parent to be at risk. Inherit one copy and you are a carrier, generally unaffected, but able to pass it on. Crucially, having two copies does not guarantee illness. Penetrance is incomplete, and plenty of people with the genotype never load enough iron to come to harm. Recent long-running cohort data, though, suggests the risk was underestimated for years, and that much of the excess illness shows up after 60.
Why Ireland, and why the north-west especially
The variant is ancient here. Researchers found it in the DNA of an Early Bronze Age man from Rathlin Island, so it has been circulating on this island for at least 4,000 years. Whether that reflects an old advantage in a low-iron diet or simply genetic drift is still argued, but the result is not in dispute.
In February 2026, researchers from the University of Edinburgh and RCSI published a genetic risk map of the British Isles and Ireland in Nature Communications, drawing on more than 400,000 people. The Northwest Irish ancestry group, which covers Northern Ireland and a broad sweep of the northern Republic from north Mayo across to Meath and up to Donegal, came out highest at 1 in 54 carrying the risk genotype. For comparison, the lowest frequency in the study was 1 in 123. Within that group, roughly 1 in 80 men are predicted to develop iron overload by the age of 80.
The same work found people recorded as white Irish were diagnosed at nearly four times the rate of white British people, and that within Britain the diagnosis map still traces the Irish emigration of the 1850s. Dr Edmund Gilbert of RCSI made the practical point plainly: Irish communities, at home and abroad, should be a priority for screening.
The after-50 angle, and why it hits women later
The HSE puts typical symptom onset between 30 and 60. Men tend to present earlier. Women often do not develop symptoms until after menopause, because every period was quietly exporting iron. Once that stops, ferritin can climb steadily, and a woman who sailed through her forties can find herself accumulating iron in her fifties with no idea it is happening.
This is the heart of why the condition gets missed in our age group. Every early symptom is also a plausible symptom of midlife itself:
- Fatigue that rest does not touch, usually the first and most common complaint
- Joint pain, classically in the knuckles of the index and middle fingers, along with wrists, hips and knees
- Brain fog, low mood, anxiety and irritability
- Loss of libido, erectile difficulties, or menstrual changes
- Unexplained weight loss and general weakness
Later signs are harder to dismiss: abdominal pain and swelling, skin that looks permanently tanned in people with lighter skin, jaundice, thirst and frequent urination, shortness of breath or an irregular heartbeat. Those point to damage already done to the liver, pancreas or heart, which is the whole argument for asking early.
Getting tested is genuinely simple
This is not an exotic workup. Your GP can start with two blood tests: transferrin saturation, which shows how much iron is in transit, and serum ferritin, which reflects how much is stored. A saturation above roughly 45 to 50 per cent alongside a raised ferritin is the trigger for an HFE genotype test looking for the C282Y variant. If that is positive, you will normally be referred on to check whether any organ damage has occurred.
One number matters more than any other: siblings of someone diagnosed have a 1 in 4 chance of the same genotype. If haemochromatosis turns up in your family, screening relatives is the single highest-yield thing anyone can do. Telling your brothers and sisters is, unglamorously, as valuable as anything a consultant will do for you.
Treatment is a pint at a time
There is no cure, but the treatment is old, cheap and effective. Venesection removes blood, and with it iron: every 500ml unit takes about 250mg of iron out of circulation. During the induction phase this happens weekly, sometimes for a year or two, until stores come down towards a target ferritin of around 50 micrograms per litre. After that comes maintenance, typically two to four sessions a year, for life.
Access in Ireland varies more than it should. Medical card holders receive venesection free of charge but generally have to attend hospital, because the procedure has not been reimbursed in general practice under the GMS contract. That is changing: in March 2025, HSE West and North West launched Ireland’s first competency-based training programme with the Irish Haemochromatosis Association, run through Sligo University Hospital, so GP practices can safely treat lower-risk patients closer to home. With over 80 per cent of patients needing little specialist input, and given where the risk is concentrated, starting in the north-west was the right call.
There is also a route many people do not know about. The Irish Blood Transfusion Service runs a free phlebotomy service for people with haemochromatosis at its clinic on D’Olier Street in Dublin, and since 2019 it has accepted donations from patients in the maintenance phase who meet standard donor criteria, up to four times a year with at least 90 days between sessions. Your treatment becomes someone else’s transfusion. First-time donors with the condition must be 69 or under, and you keep up an annual ferritin check with your own doctor.
What to do at the dinner table, and what not to bother with
Diet is a supporting act, not the treatment. The HSE is clear that once you are treated properly you do not need a restrictive diet. A few sensible habits apply: skip iron and high-dose vitamin C supplements, which boost absorption; avoid raw oysters, clams and other raw shellfish, because a bacterium called Vibrio vulnificus thrives in iron-rich blood; and go easy on alcohol, which raises iron levels and strains a liver already carrying extra. Nobody is asking you to give up red meat.
Where to turn
The Irish Haemochromatosis Association (01 873 5911, [email protected]) runs a helpline, patient guides and resources for GPs and practice nurses from the Carmichael Centre in Dublin. World Haemochromatosis Awareness Week falls on 1 to 7 June each year, and the association’s framing is hard to improve on: a hidden condition, hiding in plain sight, in the country where it is most common.
At Críonna Health we keep coming back to the same theme: a lot of what gets filed under “getting older” is actually something specific, named and treatable. Haemochromatosis is the cleanest example. Common in this country, found with two routine blood tests, treated by giving blood, and quietly damaging to people who never thought to ask.
If you are tired in a way that does not make sense, if your knuckles ache, or if anyone in your family has ever been told they have “too much iron”, bring it to your GP and use the word. It costs you one conversation.
This article is for general information and is not a substitute for medical advice. If you have symptoms or a family history of haemochromatosis, speak to your GP.
📷 Photo by Anshul (@tomatopictures1) on Unsplash
