Fatigue and a lack of mental clarity, commonly referred to as brain fog, may be linked to iron deficiency, a condition that affects a significant portion of the U.S. population, particularly women. Experts estimate that approximately 30 million women in the United States have iron deficiency, with about 15% also experiencing iron deficiency anemia.
Iron is a crucial mineral essential for every cell in the body to utilize energy. "Your muscles cannot contract without iron. Your brain cannot think without iron," explained Dr. Steven Fein, a hematologist and owner of HemeOnCall. Iron deficiency exists on a spectrum, with iron deficiency without anemia being a milder form and iron deficiency anemia representing a more severe stage where the body's bone marrow struggles to produce sufficient red blood cells due to inadequate iron supplies.
Symptoms and Causes
The most common symptom reported for both iron deficiency and iron deficiency anemia is persistent fatigue. Cognitive issues, such as difficulty concentrating and mental fog, are also well-documented. According to Dr. Joseph Shatzel, a hematologist and associate professor at Oregon Health and Science University, low iron can also lead to impaired memory and mood complications, potentially worsening depression and anxiety. Other signs may include shortness of breath after exertion, dizziness, lightheadedness, cravings for ice, restless leg syndrome, and hair thinning.
For individuals who menstruate, blood loss during menstrual cycles is a primary cause of iron depletion, as blood is the body's main store of iron. "Probably about half of the women who have low iron have heavy periods that they don’t even realize a lot of the time," Fein said. However, other underlying causes exist, including inflammatory bowel disease, Crohn's disease, gastric ulcers, and Celiac disease. In men, iron deficiency is often indicative of more severe underlying conditions. Post-bariatric surgery can also lead to iron deficiency due to malabsorption issues.
Iron Deficiency in Pregnancy
Iron deficiency and iron deficiency anemia are also prevalent and often under-diagnosed during pregnancy. Research indicates that this deficiency can lead to complications for both the mother and the baby, such as preterm birth, low birth weight, and developmental delays. Fein noted that severe fatigue in pregnant individuals can also increase the likelihood of C-sections. The issue disproportionately affects Black individuals, with half of pregnant Black individuals experiencing iron deficiency compared to one-third of non-Black pregnant individuals.
Diagnosis and Treatment
Neither iron deficiency nor iron deficiency anemia should be overlooked, as both can lead to significant health problems. Diagnosis is typically made through blood tests ordered by a doctor. However, routine screening for iron deficiency is not standard practice in the U.S., meaning individuals may need to advocate for testing. "We do not have a routine recommendation in the U.S. to screen for iron deficiency," Shatzel stated.
Treatment options include oral iron supplements or intravenous (IV) iron therapy, with IV iron often proving more effective. In rare, untreated cases, blood transfusions may be necessary. Addressing the underlying cause is also critical. For individuals with heavy periods, interventions such as birth control may be beneficial. For those with gastrointestinal issues, further medical workups might be required.
Quality of Life and Gender Inequality
Restoring iron levels to a healthy range can significantly improve quality of life. Symptoms like tiredness, brain fog, and anxiety can impede daily functioning. With normal iron levels, athletic performance may improve, and individuals may experience increased energy for work and other activities. Fein highlighted that this is also a matter of gender inequality, as the functional limitations caused by iron deficiency can affect women's career advancement and earning potential.
"My general sense of this is that it hasn’t really been as important as it should be to the medical community because this is a very common thing that the majority of people suffering from are women," Shatzel commented. Individuals experiencing symptoms associated with iron deficiency are encouraged to discuss potential testing with their healthcare providers.
