Iron Overload

When the body stores too much iron, it can damage vital organs over time. Though often inherited, iron overload is treatable if caught early, helping prevent serious complications affecting the heart, liver, and other organs.

Table of contents

• What is Iron Overload?
• Alternative Names
• Causes and Types
• Who is at Risk?
• Symptoms and Signs
• Organs Most Affected
• How is Iron Overload Diagnosed?
• Treatment Options
• Diet and Lifestyle
• Potential Complications
• Outlook and Living with Iron Overload

What is Iron Overload?

Iron overload is a condition in which your body absorbs and retains too much iron. While iron is an essential mineral needed for oxygen transport, energy production, and immune function, excessive amounts become toxic to the body^[1][2].

Your body carefully regulates iron levels under normal circumstances. However, the body has no natural mechanism to get rid of excess iron. When too much iron accumulates, it gets stored in your tissues and organs, particularly the liver, heart, and pancreas^[1]. Over time, this buildup can damage these organs and lead to serious health problems.

The excess iron creates unstable molecules called free radicals through a process called oxidation. These free radicals cause oxidative stress, which damages cells and tissues. Think of it like rust forming on metal—the iron reacts with oxygen and causes damage^[2][7].

Alternative Names

Hemochromatosis, Haemochromatosis, Iron overload disease

Causes and Types

Iron overload can develop in two main ways: as a primary condition inherited from your parents, or as a secondary result of other medical conditions or treatments^[1][4].

Primary (Hereditary) Iron Overload

Most people with iron overload inherit it from their parents. This form is called hereditary hemochromatosis or primary hemochromatosis. It occurs when you inherit an altered gene that causes your body to absorb too much iron from food^[1][3].

To develop this condition, you need two copies of the altered gene—one from each parent. If your parents each have only one copy, they likely won’t have the condition themselves or even know they carry the gene. If you inherit only one copy, you become a carrier but typically won’t develop symptoms^[1].

Changes in the HFE gene usually cause hereditary hemochromatosis. The two most common variations are called C282Y and H63D. These gene changes affect how your body regulates the hormone hepcidin, which normally controls iron absorption^[1][4].

A less common form called juvenile hemochromatosis results from changes in the HJV or HAMP genes. This type causes iron to build up much more quickly, so symptoms appear between ages 15 and 30^[1].

Secondary Iron Overload

You can also develop iron overload as a result of another medical condition or treatment. Common causes of secondary iron overload include^[1][2]:

• Frequent blood transfusions, especially in people with thalassemia, sickle cell disease, or anemia
• Advanced liver disease, where the liver cannot process iron properly
• Heavy alcohol use
• Chronic hemolysis (breakdown of red blood cells)

Each unit of transfused blood contains about 200 mg of iron. People receiving regular transfusions can accumulate 0.32 to 0.64 mg of iron per kilogram of body weight per day^[11].

Rarely, a developing baby with preexisting liver disease can develop neonatal hemochromatosis, where iron builds up very quickly before birth^[1].

Who is at Risk?

Hereditary hemochromatosis is most common in white people with ancestors from Northern Europe, particularly those of Irish, Scottish, or Scandinavian descent. It affects approximately 1 in every 200 to 500 people in these populations. The condition is less common in people of African American, Hispanic, Asian, or Native American descent^[1][4][6].

Men and women are equally affected by hereditary hemochromatosis. However, men are more likely to develop symptoms and typically experience them at a younger age than women. Women often don’t show symptoms until after menopause because they lose iron regularly through menstruation and pregnancy^[3].

Risk factors for secondary iron overload include^[1]:

• Liver disease
• Anemia requiring frequent blood transfusions
• Heavy alcohol use
• Having blood disorders like thalassemia or sickle cell disease

Symptoms and Signs

Many people with iron overload don’t have symptoms at first. Although hereditary hemochromatosis is usually present at birth, it takes a long time for iron to build up to levels that cause problems. Most people don’t develop symptoms until their 40s or 50s. Some people with milder forms may never notice symptoms, or symptoms might appear much later in life^[1][3].

When symptoms do appear, they often overlap with other common conditions, making diagnosis challenging. Common symptoms include^[1][3]:

• Feeling very tired all the time (fatigue)
• Joint pain, especially in the knuckles of the index and middle fingers (sometimes called “iron fist”)
• Abdominal pain, particularly in the upper right area
• Unexplained weight loss
• Weakness
• Skin darkening or changes in skin color (bronze, gray, or yellowish tint)
• Low sex drive or inability to get or maintain an erection (erectile dysfunction)
• Irregular, stopped, or missed menstrual periods in women
• Heart flutters (arrhythmias)
• Brain fog, mood swings, depression, and anxiety
• Loss of body hair

Organs Most Affected

• Liver
• Heart
• Pancreas
• Pituitary gland
• Thyroid
• Adrenal glands
• Joints
• Reproductive system
• Skin

Iron overload affects your heart, liver, and pancreas most severely. As iron accumulates in these organs over time, it can cause serious damage^[1][7].

In the liver, excess iron can lead to scarring (cirrhosis) and increase the risk of liver cancer. The heart may develop irregular rhythms or fail to pump blood effectively (heart failure). In the pancreas, iron deposits can damage the cells that produce insulin, leading to diabetes^[7].

Iron also affects hormone-producing glands like the pituitary, thyroid, and adrenal glands, as well as the reproductive system. This can result in problems with growth, metabolism, and fertility^[1].

In the joints, iron deposits cause pain and swelling, particularly in the hands, wrists, elbows, hips, knees, and ankles. The skin may develop a bronze or gray discoloration, sometimes called “bronze diabetes” when combined with diabetes^[7].

How is Iron Overload Diagnosed?

Diagnosing iron overload can be challenging because early symptoms are nonspecific and similar to many other conditions. Many people are diagnosed after blood tests done for other reasons show high iron levels. Family screening is also common—if someone in your family has hereditary hemochromatosis, doctors may recommend testing even if you have no symptoms^[3][9].

Blood Tests

The two key blood tests to detect iron overload are^[9]:

• Serum transferrin saturation: This test measures the amount of iron bound to transferrin, the protein that carries iron in your blood. Values greater than 45% are considered too high.
• Serum ferritin: This test measures the amount of iron stored in your liver. Elevated ferritin levels indicate excess iron storage.

These tests are best performed after fasting. Because other conditions can also cause elevated results, you may need to have the tests repeated for accurate results^[9].

Additional Testing

If blood tests suggest iron overload, your healthcare provider may recommend additional tests^[9]:

• Liver function tests: These help identify liver damage
• MRI (Magnetic Resonance Imaging): This is a fast, noninvasive way to measure the degree of iron overload in the liver and heart
• Genetic testing: Testing for changes in the HFE gene can confirm hereditary hemochromatosis
• Liver biopsy: Removing a small sample of liver tissue can assess liver damage and measure iron concentration

Treatment Options

While there’s currently no cure for iron overload, treatments can reduce the amount of iron in your body and prevent organ damage. Early diagnosis and consistent treatment are essential^[3][14].

Venesection (Phlebotomy)

The most common treatment for iron overload is a procedure to remove some of your blood, called venesection or phlebotomy. This procedure is similar to donating blood^[14].

During the procedure, you lie back in a chair and a needle is used to drain a small amount of blood, usually about 500ml, from a vein in your arm. The removed blood contains red blood cells that hold iron, and your body uses up more iron to replace them, helping reduce overall iron levels^[14].

Treatment occurs in two stages^[14]:

• Induction phase: Blood is removed frequently, usually weekly, until your iron levels return to normal. This can take up to a year or more.
• Maintenance phase: Blood is removed less often, usually 2 to 4 times a year, to keep iron levels under control. This is typically needed for the rest of your life.

Chelation Therapy

Chelation therapy may be used when regular blood removal isn’t possible—for example, if you have very thin or fragile veins. This treatment involves taking medicine that binds to iron in your blood and helps your body remove it through urine or stool^[14].

Commonly used medicines include deferasirox (taken by mouth) and desferrioxamine (given by injection). These medications are especially important for people who develop iron overload from regular blood transfusions^[12][14].

Diet and Lifestyle

If you’re receiving treatment for iron overload, you typically don’t need to make major changes to your diet. Avoiding all iron-containing foods isn’t necessary and could mean you don’t get all the nutrition you need^[14].

Healthcare providers usually recommend^[14]:

• Eating a generally healthy, balanced diet
• Avoiding breakfast cereals that have been fortified with extra iron
• Not taking iron or vitamin C supplements, as these can increase iron levels
• Being careful not to eat raw oysters and clams, which may contain bacteria that can cause serious infections in people with high iron levels
• Avoiding excessive alcohol, as it can increase iron levels and put extra strain on your liver

Potential Complications

Without treatment, iron overload can lead to serious, life-threatening complications. The toxicity depends on how much iron is stored in tissues, how long it’s been building up, and individual factors^[13].

Potential complications include^[3][6][7]:

• Liver cirrhosis (scarring of the liver)
• Liver cancer
• Heart failure
• Cardiac arrhythmias (irregular heartbeat)
• Diabetes (when iron damages insulin-producing cells in the pancreas)
• Arthritis and joint damage
• Osteoporosis
• Hypogonadism (inadequate sex hormone production)
• Infertility in both men and women
• Increased risk of infections

Heart and liver complications are particularly serious and can be fatal if iron overload remains untreated^[13].

Outlook and Living with Iron Overload

If iron overload is diagnosed and treated early, it does not affect life expectancy and is unlikely to result in serious problems. The condition is treatable, and treatment can help prevent complications^[1][6].

Many people do experience some ongoing symptoms, particularly fatigue and joint pain, even with treatment. It’s important to give yourself time and space to process having a genetic condition if you’ve been recently diagnosed^[18].

The risk of complications is low if you’ve been diagnosed early and have treatment as often as your doctor recommends. Regular monitoring and consistent treatment are key to living well with iron overload^[18].

If you have hereditary hemochromatosis, your parents, children, and siblings (first-degree relatives) should be screened for the condition, even if they have no symptoms. Genetic counseling may be helpful if you’re planning a family^[1][6].