Hereditary haemochromatosis

Causes and inheritance

The commonest form is caused by variants in genes that regulate iron absorption, most often changes in the HFE gene identified in the mid‑1990s. The condition is usually inherited in an autosomal recessive genetic pattern: an affected person typically has two altered copies of a relevant gene, while parents who each carry one altered copy are generally well. Hereditary haemochromatosis is relatively more frequent among people of Northern European and Celtic ancestry, although it can occur in any population (population groups).

How iron accumulates and where it acts

Normal physiology balances intestinal iron uptake with body needs. In hereditary haemochromatosis that regulation fails, and increased absorption leads to progressive iron loading. Iron is deposited in multiple tissues and organs, commonly the liver, pancreas, heart, joints and skin. Over time those deposits interfere with normal function and can cause fibrosis, endocrine dysfunction and organ failure.

Clinical features and complications

Early symptoms are often nonspecific and may include fatigue, decreased stamina, and joint aches. With established iron overload, signs and complications can include:

• Chronic liver disease ranging from enlargement to cirrhosis and an increased risk of liver cancer.
• Endocrine problems such as diabetes and loss of libido.
• Cardiac disease including cardiomyopathy and arrhythmias.
• Arthropathy, skin darkening, and reduced energy.

Because early manifestations are vague, awareness of family history and screening tests are important. Individuals and clinicians refer to the constellation of signs and symptoms when deciding on further testing.

Diagnosis

Initial laboratory evaluation typically measures transferrin saturation and serum ferritin to detect increased iron stores. If these tests suggest iron overload, genetic testing and specialist assessment are used to confirm hereditary haemochromatosis and to distinguish it from other causes of raised iron indices. Imaging and liver assessment may be required to determine the degree of organ injury.

Treatment, screening and prognosis

The mainstay of treatment is regular therapeutic phlebotomy (planned blood removal) to reduce body iron and prevent further deposition. In some situations iron chelation medications are used. With early diagnosis and consistent treatment, many people avoid serious organ damage; untreated advanced disease can lead to irreversible complications. Relatives of an affected person are often offered testing because early detection improves outcomes.

Notable facts
Hereditary haemochromatosis illustrates how a common inherited tendency can remain silent for decades before producing disease. Management emphasizes lifelong monitoring and timely intervention to preserve organ function and quality of life. For introductory patient information and clinical guidance see resources linked here: overview, further genetic information genetics, biochemical details on iron, population notes epidemiology, affected tissues and organs, and typical symptoms.