Hereditary hemochromatosis (he-moe-kroe-muh-TOE-sis) causes your body to absorb too much iron from the food you eat. Excess iron is stored in your organs, especially your liver, heart and pancreas. Too much iron can lead to life-threatening conditions, such as liver disease, heart problems and diabetes.
The genes that cause hemochromatosis are inherited, but only a minority of people who have the genes ever develop serious problems. Signs and symptoms of hereditary hemochromatosis usually appear in midlife.
Treatment includes regularly removing blood from your body. Because much of the body's iron is contained in red blood cells, this treatment lowers iron levels.
Some people with hereditary hemochromatosis never have symptoms. Early signs and symptoms often overlap with those of other common conditions. Common symptoms include:
- Joint pain
- Abdominal pain
Later signs and symptoms of the disease may include:
- Loss of sex drive
- Heart failure
- Liver failure
When signs and symptoms typically appear
Hereditary hemochromatosis is present at birth. But, most people don't experience signs and symptoms until later in life — usually between the ages of 50 and 60 in men and after age 60 in women. Women are more likely to develop symptoms after menopause, when they no longer lose iron with menstruation and pregnancy.
When to see a doctor
See your doctor if you experience any of the signs and symptoms of hereditary hemochromatosis. If you have an immediate family member who has hemochromatosis, ask your doctor about genetic tests that can determine if you have inherited the gene that increases your risk of hemochromatosis.
Hereditary hemochromatosis is caused by a mutation in a gene that controls the amount of iron your body absorbs from the food you eat. These mutations are passed from parents to children. This type of hemochromatosis is by far the most common type.
Gene mutations that cause hemochromatosis
A gene called HFE is most often the cause of hereditary hemochromatosis. You inherit one HFE gene from each of your parents. The HFE gene has two common mutations, C282Y and H63D. Genetic testing can reveal whether you have these mutations in your HFE gene.
- If you inherit 2 abnormal genes, you may develop hemochromatosis. You can also pass the mutation on to your children. But, not everyone who inherits two genes develops problems linked to the iron overload of hemochromatosis.
- If you inherit 1 abnormal gene, you won't develop hemochromatosis. You are considered a gene mutation carrier and can pass the mutation on to your children. But, they wouldn't develop disease unless they also inherited another abnormal gene from the other parent.
How hemochromatosis affects your organs
Iron plays an essential role in several body functions, including helping in the formation of blood. But, too much iron is toxic.
A hormone called hepcidin, secreted by the liver, normally controls how iron is used and absorbed in the body, as well as how excess iron is stored in various organs. In hemochromatosis, the normal role of hepcidin is disrupted, causing your body to absorb more iron that it needs.
This excess iron is stored in major organs, especially your liver. Over a period of years, the stored iron can cause severe damage that may lead to organ failure and chronic diseases, such as cirrhosis, diabetes and heart failure. Though many people have faulty genes that cause hemochromatosis, only about 10 percent of them develop iron overload to a degree that causes tissue and organ damage.
Hereditary hemochromatosis isn't the only type of hemochromatosis. Other types include:
- Juvenile hemochromatosis. This causes the same problems in young people that hereditary hemochromatosis causes in adults. But iron accumulation begins much earlier, and symptoms usually appear between the ages of 15 and 30. This disorder is caused by mutations in the hemojuvelin or hepcidin genes.
- Neonatal hemochromatosis. In this severe disorder, iron builds up rapidly in the liver of the developing fetus. It is thought to be an autoimmune disease, in which the body attacks itself.
- Secondary hemochromatosis. This form of the disease is not inherited and is often referred to as iron overload. People with certain types of anemia or chronic liver disease may need multiple blood transfusions, which can lead to excess iron accumulation.
Factors that increase your risk of hereditary hemochromatosis include:
- Having 2 copies of a mutated HFE gene. This is the greatest risk factor for hereditary hemochromatosis.
- Family history. If you have a first-degree relative — a parent or sibling — with hemochromatosis, you're more likely to develop the disease.
- Ethnicity. People of Northern European descent are more prone to hereditary hemochromatosis than are people of other ethnic backgrounds. Hemochromatosis is less common in African-Americans, Hispanics and Asian-Americans.
- Your sex. Men are more likely than women to develop signs and symptoms of hemochromatosis at an earlier age. Because women lose iron through menstruation and pregnancy, they tend to store less of the mineral than men do. After menopause or a hysterectomy, the risk for women increases.
Untreated, hereditary hemochromatosis can lead to a number of complications, especially in your joints and in organs where excess iron tends to be stored — your liver, pancreas and heart. Complications can include:
- Liver problems. Cirrhosis — permanent scarring of the liver — is just one of the problems that may occur. Cirrhosis increases your risk of liver cancer and other life-threatening complications.
- Pancreas problems. Damage to the pancreas can lead to diabetes.
- Heart problems. Excess iron in your heart affects the heart's ability to circulate enough blood for your body's needs. This is called congestive heart failure. Hemochromatosis can also cause abnormal heart rhythms (arrhythmias).
- Reproductive problems. Excess iron can lead to erectile dysfunction (impotence), and loss of sex drive in men and absence of the menstrual cycle in women.
- Skin color changes. Deposits of iron in skin cells can make your skin appear bronze or gray in color.
Hereditary hemochromatosis can be difficult to diagnose. Early symptoms such as stiff joints and fatigue may be due to conditions other than hemochromatosis.
Many people with the disease don't have any signs or symptoms other than elevated levels of iron in their blood. Hemochromatosis may be identified because of abnormal blood tests done for other reasons or from screening of family members of people diagnosed with the disease.
The two key tests to detect iron overload are:
- Serum transferrin saturation. This test measures the amount of iron bound to a protein (transferrin) that carries iron in your blood. Transferrin saturation values greater than 45 percent are considered too high.
- Serum ferritin. This test measures the amount of iron stored in your liver. If the results of your serum transferrin saturation test are higher than normal, your doctor will check your serum ferritin.
Because a number of other conditions can also cause elevated ferritin, both blood tests are typically abnormal among people with this disorder and are best performed after you have been fasting. Elevations in one or all of these blood tests for iron can be found in other disorders. You may need to have the tests repeated for the most accurate results.
People with abnormal iron tests should undergo genetic testing to confirm the diagnosis. Most people will have two gene mutations.
Your doctor may suggest other tests to confirm the diagnosis and to look for other problems:
- Liver function tests. These tests can help identify liver damage.
- MRI. An MRI is a fast and noninvasive way to measure the degree of iron overload in your liver.
- Testing for gene mutations. Testing your DNA for mutations in the HFE gene is recommended if you have high levels of iron in your blood. If you're considering genetic testing for hemochromatosis, discuss the pros and cons with your doctor or a genetic counselor.
- Removing a sample of liver tissue for testing (liver biopsy). If liver damage is suspected, your doctor may have a sample of tissue from your liver removed, using a thin needle. The sample is sent to a laboratory to be checked for the presence of iron as well as for evidence of liver damage, especially scarring or cirrhosis. Risks of biopsy include bruising, bleeding and infection.
Screening healthy people for hemochromatosis
Genetic testing is recommended for all first-degree relatives — parents, siblings and children — of anyone diagnosed with hemochromatosis. If a mutation is found in only one parent, then children do not need to be tested.
Doctors can treat hereditary hemochromatosis safely and effectively by removing blood from your body (phlebotomy) on a regular basis, just as if you were donating blood. Some blood collection centers in the United States have obtained permission from the Food and Drug Administration to collect this blood and use it for transfusion.
The goal of phlebotomy is to reduce your iron levels to normal. The amount of blood removed and how often it's removed depend on your age, your overall health and the severity of iron overload. It may take a year or longer to reduce the iron in your body to normal levels.
- Initial treatment schedule. Initially, you may have a pint (about 470 milliliters) of blood taken once or twice a week — usually in a hospital or your doctor's office. While you recline in a chair, a needle is inserted into a vein in your arm. The blood flows from the needle into a tube that's attached to a blood bag.
- Maintenance treatment schedule. Once your iron levels have returned to normal, blood can be removed less often, typically every two to four months. Some people may maintain normal iron levels without having any blood taken, and some may need to have blood removed monthly. The schedule depends on how rapidly iron accumulates in your body.
Treating hereditary hemochromatosis can help alleviate symptoms of tiredness, abdominal pain and skin darkening. It can help prevent serious complications such as liver disease, heart disease and diabetes. If you already have one of these conditions, phlebotomy may slow the progression of the disease, and in some cases even reverse it.
Phlebotomy will not reverse cirrhosis or improve joint pain.
If you have cirrhosis, your doctor may recommend periodic screening for liver cancer. This usually involves an abdominal ultrasound and a blood test.
Chelation for those who can't undergo blood removal
If you can't undergo phlebotomy, because you have anemia, for example, or heart complications, your doctor may recommend a medication to remove excess iron. The medication can be injected into your body, or it can be taken as a pill. The medication binds excess iron, allowing your body to expel iron through your urine or stool in a process that's called chelation.
Make an appointment with your primary care doctor if you have any signs or symptoms that worry you. You may be referred to a specialist in digestive diseases (gastroenterologist), or to another specialist, depending on your symptoms. Here's some information to help you get ready for your appointment, and what to expect from your doctor.
What you can do
- Be aware of any pre-appointment restrictions. At the time you make the appointment, be sure to ask if there's anything you need to do in advance, such as restrict your diet.
- Write down any symptoms you're experiencing, including any that may seem unrelated to the reason for which you scheduled the appointment.
- Write down key personal information, including any major stresses or recent life changes. Learn if you have any liver disease in your family by asking your family members, if possible.
- Make a list of all medications, vitamins or supplements that you're taking.
- Take a family member or friend along to help you remember what's been discussed.
- Write down questions to ask your doctor.
Questions to ask your doctor
Some basic questions to ask your doctor include:
- What's the most likely cause of my symptoms?
- What kinds of tests do I need?
- Is my condition temporary or will I always have it?
- What treatments are available? And, what do you suggest for me?
- I have other health conditions. How can I best manage these conditions together?
- Are there any restrictions that I need to follow?
- Are there any brochures or other printed material that I can take with me? What websites do you recommend?
Don't hesitate to ask other questions during your appointment.
What to expect from your doctor
Be ready to answer questions your doctor may ask:
- When did you begin experiencing symptoms?
- Have your symptoms been continuous or do they come and go?
- How severe are your symptoms?
- Does anything seem to improve your symptoms?
- What, if anything, appears to worsen your symptoms?
- Does anyone in your family have hemochromatosis?
- How many alcoholic beverages do you drink in a week?
- Are you taking iron supplements or vitamin C?
- Do you have a history of viral hepatitis, such as hepatitis C?
- Have you required blood transfusions before?
In addition to therapeutic blood removal, you may further reduce your risk of complications from hemochromatosis if you:
- Avoid iron supplements and multivitamins containing iron. These can increase your iron levels even more.
- Avoid vitamin C supplements. Vitamin C increases absorption of iron. There's usually no need to restrict vitamin C in your diet, however.
- Avoid alcohol. Alcohol greatly increases the risk of liver damage in people with hereditary hemochromatosis. If you have hereditary hemochromatosis and you already have liver disease, avoid alcohol completely.
- Avoid eating raw fish and shellfish. People with hereditary hemochromatosis are susceptible to infections, particularly those caused by certain bacteria in raw fish and shellfish.
Additional dietary changes generally aren't required for people receiving blood removal treatment.