|SSM Cardinal Glennon Children's Medical Center|
Hereditary hemochromatosis (hee-muh-kro-muh-TOE-sus) is a genetic disease that causes the body to absorb and store too much iron.
Iron is an important nutrient that our bodies get from food. It's in every red blood cell and is the main component of hemoglobin, the substance in red blood cells that carries oxygen away from the lungs to the rest of the body.
In hemochromatosis, the body absorbs about twice as much iron as it should. This excess iron can't leave the body. Instead, it's stored in the joints and major organs such as the liver, heart, brain, pancreas, and lungs. Over time, this iron can build to toxic levels that can cause diabetes and damage or even destroy an organ.
Even though kids are born with hemochromatosis, the very slow buildup of iron means that it might not be diagnosed until adulthood, when symptoms begin.
Therapies and diet changes can help slow the progression of the disease. That's why it's especially important for kids with a family history of hemochromatosis to be tested early on.
Hereditary hemochromatosis is caused by a mutation in a gene that controls how much iron the body absorbs from food. It's actually fairly common, affecting about 1 in 200 people. The disease is considered "autosomal recessive," which means that someone must have two copies of the mutated gene — one from each parent — to get it.
In the United States, 1 out of every 8 to 10 people has one copy of the mutated gene. These people are carriers — they can pass the gene on to their children but won't get the disease. Many people who inherit two mutated genes will absorb extra iron, but only some will absorb enough to cause health problems.
Carriers and other people who don't have hereditary hemochromatosis can still have iron build up if they have another genetic defect or a health problem that affects iron absorption, such as alcohol abuse or hepatitis, an inflammation of the liver.
Signs and Symptoms
Some people with hemochromatosis never develop symptoms. Kids who are diagnosed with it rarely have symptoms because iron takes years to build up.
An adult with the disease eventually may have:
Fortunately, not all adults with too much iron in the system develop these conditions.
Sometimes, people with hemochromatosis are diagnosed with conditions that can have similar symptoms, like chronic hepatitis, some forms of diabetes, Alzheimer's disease, iron deficiency, or menstrual problems.
If hemochromatosis is diagnosed and treated early enough, damage from iron buildup can be prevented. Doctors usually diagnose iron overload with these blood tests:
Genetic testing for the gene mutation that causes the disease will find most, but not all, cases of hemochromatosis. Sometimes doctors need to do a biopsy, taking a small sample of liver tissue to look for iron deposits or changes in the cells.
If you have a family history of hereditary hemochromatosis, tell your child's doctor. The doctor may recommend checking iron levels or doing genetic testing, especially if a close relative (like a spouse, parent, child, or sibling) has the disease.
Doctors treat the iron overload from hereditary hemochromatosis by regularly drawing blood to lower the level of iron. This process, called phlebotomy (flih-BOT-uh-mee), is similar to making blood donations.
During the initial "de-ironing" phase, blood is removed once or twice a week until a person's iron levels drop to normal. This phase may take 2 to 3 years. After that, a person may need phlebotomy done three or four times a year to make sure iron levels stay down. Iron levels then have to be checked about once a year, and treatment continues for life. The goal is to prevent any organ damage from iron overload.
Caring for Your Child
Treatment for kids usually isn't as aggressive as for adults. Minor changes in diet often can help slow iron buildup.
Your child's doctor will recommend ways to delay or lower iron overload. These might include: