You’re getting enough sleep. You’re not skipping meals. You’re not doing anything obviously wrong, and yet the tiredness is constant, the kind that doesn’t lift after a good night or a restful weekend. You get breathless climbing stairs that never used to bother you. Your concentration slips in the middle of conversations. You feel cold when everyone around you is fine. You push through because you have to, and you tell yourself you’re just busy, just stressed, just getting older.
For a significant number of women who feel this way, the explanation isn’t lifestyle. It’s anemia, and it’s one of the most commonly missed and most commonly undertreated conditions in women’s health.
What Anemia Actually Is
More Than Just Low Iron
Anemia is a condition in which the blood doesn’t carry enough oxygen to meet the body’s needs. This happens when there aren’t enough healthy red blood cells, or when the red blood cells present don’t contain enough hemoglobin, the protein responsible for binding oxygen and transporting it through the bloodstream. Every cell in the body depends on a steady oxygen supply to function properly. When that supply is reduced, the effects show up everywhere: in energy levels, cognitive function, physical capacity, temperature regulation, and the ability to recover from ordinary daily demands.
Iron deficiency is the most common cause of anemia globally, and it disproportionately affects women. But anemia is not a single condition. It can also result from deficiencies in vitamin B12 or folate, from chronic illness that disrupts red blood cell production, from thyroid dysfunction, or from conditions affecting the bone marrow. Getting the cause right matters because the treatment is entirely different depending on what’s driving it, and treating the wrong thing produces no improvement.
Why Women Are Disproportionately Affected
Women face a set of physiological circumstances that make anemia significantly more likely than in men. Menstruation involves monthly blood loss, and for women with heavy periods, that loss is substantial enough to consistently deplete iron stores faster than diet alone can replenish them. Pregnancy dramatically increases iron demand to support the developing baby and placenta, and many women enter pregnancy with already marginal stores. The postpartum period involves blood loss at delivery and the continued demands of breastfeeding, leaving iron levels depleted at a time when energy demand is at its highest.
Beyond the reproductive years, women remain at risk. Dietary patterns that are low in red meat or that emphasise foods that inhibit iron absorption, gastrointestinal conditions that reduce nutrient absorption, and the often-overlooked blood loss associated with fibroids or adenomyosis all contribute to a picture where anemia is far more common in women than is generally recognised.
Why It Gets Missed
Symptoms That Are Too Easy to Explain Away
The symptoms of anemia are real and debilitating, but they are also easy to attribute to other things. Fatigue is the most universal symptom, but fatigue is also the most universal complaint in modern life, and women in particular are accustomed to having their tiredness normalised rather than investigated. Weakness, breathlessness on exertion, difficulty concentrating, feeling cold, headaches, and low mood are all symptoms that individually sound like stress or poor sleep or simply being too busy.
It takes a pattern, persistence, and a clinician who takes the complaint seriously to connect these symptoms to a blood test and a diagnosis. Many women live with anemia for years before it is identified, adjusting their expectations downward and assuming that this is simply how they feel.
The Problem With Incomplete Testing
Even when anemia is suspected, incomplete testing leads to missed diagnoses and inadequate treatment. A standard blood count can confirm low hemoglobin and identify anemia, but it doesn’t automatically tell you why the anemia is present or how severe the underlying deficiency is. Ferritin, the protein that stores iron in the body, is a more sensitive marker of iron depletion and can be critically low even when hemoglobin is still within the normal range. This is a stage called iron deficiency without anemia, and it produces the same symptoms.
Women whose ferritin is low but whose hemoglobin appears normal are frequently told their results are fine. They leave without a diagnosis, without treatment, and with the same fatigue they came in with. A thorough investigation of suspected anemia includes ferritin, B12, folate, a full blood count with red cell indices, and thyroid function where relevant, because these results together produce a complete picture that a hemoglobin level alone cannot.
What Anemia Feels Like Day to Day
The Physical Reality
The fatigue of anemia is not ordinary tiredness. It is a heaviness that doesn’t respond to rest, a sense of running on a fraction of normal capacity regardless of how much sleep you get. Physical tasks that should be manageable become effortful. A flight of stairs produces breathlessness. Carrying shopping bags feels harder than it should. Exercise capacity drops, and the recovery time after physical effort is longer than it used to be.
The body prioritises oxygen delivery to vital organs when supply is limited, which means the muscles, the brain, and the extremities receive less. This produces the combination of physical weakness, cognitive slowing, and persistent coldness that many women with anemia describe. Cold hands and feet, a tendency to feel chilly in environments where others are comfortable, and difficulty warming up after being outside are all recognised features of iron deficiency in particular.
The Cognitive and Emotional Impact
The brain is one of the most oxygen-dependent organs in the body, and reduced oxygen delivery affects it noticeably. Concentration becomes effortful. Words that should come easily don’t. Following complex conversations or sustained reading requires more effort than it used to, and mental fatigue sets in sooner. Low mood, irritability, and a reduced capacity to manage ordinary stress are also commonly reported, and they are often attributed to anxiety or depression rather than recognised as features of anemia.
For women managing work, family, and the demands of daily life, this cognitive load has real consequences. It affects performance, relationships, and quality of life in ways that are significant even if they are hard to quantify.
What Causes Anemia in Women
Heavy Menstrual Bleeding
Heavy periods are one of the leading causes of iron deficiency anemia in women of reproductive age, and they are also one of the most undertreated. Many women with heavy bleeding have no reference point for what a normal period looks like, and healthcare providers don’t always ask the right questions to identify blood loss that is clinically significant. Flooding, passing clots larger than a fifty cent piece, changing protection hourly, or bleeding for more than seven days are all indicators of blood loss that is likely to deplete iron stores over time.
Addressing the anemia without addressing the heavy bleeding produces only temporary improvement. The underlying blood loss continues, iron stores deplete again, and the cycle repeats. Effective management requires both: repleting iron and investigating and treating the source of the excessive loss.
Pregnancy and the Postpartum Period
Iron demand increases substantially during pregnancy, and the dietary iron available rarely meets that demand without supplementation. Women who enter pregnancy with borderline iron stores are at high risk of developing anemia during the second and third trimesters. Postpartum blood loss at delivery, combined with the iron already depleted during pregnancy, leaves many women in the weeks and months after birth with significantly low stores, often at a time when anemia is least expected and least tested for.
Postpartum fatigue is frequently attributed entirely to sleep deprivation and the demands of a newborn. Anemia is a real contributor to that fatigue for many women, and identifying and treating it makes a meaningful difference to recovery and capacity in the months after birth.
Dietary Factors and Absorption
Plant-based diets and diets low in red meat reduce the intake of haem iron, the form most efficiently absorbed by the body. Non-haem iron from plant sources is absorbed at a fraction of the rate of haem iron, and its absorption is further reduced by compounds found in coffee, tea, calcium-rich foods, and high-fibre grains when consumed at the same time. Women following vegetarian or vegan diets need to be particularly deliberate about both iron intake and the conditions under which it is consumed.
Gastrointestinal conditions including coeliac disease, inflammatory bowel disease, and low stomach acid reduce iron absorption regardless of how much iron is consumed. Women with these conditions may maintain a good dietary intake and still develop deficiency because the absorption pathway is compromised. This is a situation where dietary changes alone are insufficient and supplementation under medical guidance is necessary.
Fibroids and Adenomyosis
Uterine fibroids and adenomyosis are two conditions that cause heavy menstrual bleeding and are significantly underdiagnosed in women. Both involve abnormal tissue within or around the uterus that disrupts normal menstrual patterns and produces blood loss that is consistently above normal levels. Women with either condition are at high risk of iron deficiency anemia, often chronically, because the underlying blood loss is not being managed.
If a woman has anemia that keeps returning despite supplementation and dietary attention, and she has not been investigated for fibroids or adenomyosis, that investigation is a necessary next step.
What Proper Treatment Looks Like
Getting the Diagnosis Right First
Effective treatment begins with identifying not just whether anemia is present but why it is present and how severe the underlying depletion is. Iron deficiency anemia requires iron repletion. B12 deficiency anemia requires B12, either orally or by injection depending on whether the deficiency is dietary or absorptive. Anemia driven by chronic disease or thyroid dysfunction requires addressing the underlying condition. Treating iron deficiency anemia with B12 or vice versa produces no benefit, which is why testing thoroughly before starting treatment is not optional.
Iron Supplementation: What Works and What Doesn’t
Oral iron supplementation is the most common treatment for iron deficiency anemia, but it is frequently inadequate in practice. Standard ferrous sulfate preparations cause significant gastrointestinal side effects in many women, leading to inconsistent use and slow repletion. Taking iron every other day rather than daily has been shown in research to improve absorption and reduce side effects. Taking iron with vitamin C and away from coffee, tea, and calcium improves uptake. Women who cannot tolerate oral iron or whose stores are severely depleted may be candidates for intravenous iron, which repletes stores far more rapidly and without the gastrointestinal burden of oral preparations.
Dietary changes alone are rarely sufficient to correct established iron deficiency. They are a useful complement to supplementation and important for maintaining stores once they are repleted, but they cannot replace supplementation when a genuine deficiency exists.
Monitoring and Follow-Up
Iron repletion takes time. Hemoglobin typically begins to improve within four to eight weeks of adequate treatment, but ferritin stores take longer to rebuild, often three to six months of consistent supplementation. Stopping treatment as soon as hemoglobin normalises, without confirming that ferritin has also recovered to an adequate level, is one of the most common reasons anemia recurs. Follow-up blood testing to confirm complete repletion, not just hemoglobin recovery, is an essential part of treatment.
When to Seek Help
Signs That Need Investigation
Persistent fatigue that doesn’t improve with rest, breathlessness that is out of proportion to the activity causing it, frequent headaches, difficulty concentrating, consistently cold hands and feet, and a pale or washed-out appearance that others notice are all reasons to request a blood test. Women with heavy periods, a history of anemia, a recent pregnancy, or a dietary pattern low in animal products have additional reasons to test proactively rather than waiting until symptoms become severe.
Symptoms that are worsening rather than stable, anemia that recurs after treatment, or a pattern of low ferritin that never fully recovers despite supplementation all warrant investigation into the underlying cause rather than repeated cycles of repletion alone.
What a Thorough Assessment Covers
A thorough assessment of suspected anemia covers full blood count with red cell indices, ferritin, serum iron and transferrin saturation, B12, folate, and thyroid function. Where heavy bleeding is part of the picture, a gynaecological review to assess for fibroids, adenomyosis, or other structural causes is an important part of the workup. Where absorption is suspected as a factor, investigation for coeliac disease or other gastrointestinal conditions is appropriate.
The goal is not just to confirm that anemia is present but to understand why it is present, how severe the underlying depletion is, and what combination of treatment, supplementation, and addressing the source of the problem will produce lasting improvement rather than temporary relief.
You Deserve to Feel Well
Anemia is not a minor inconvenience and it is not an inevitable part of being a woman. It is a real condition with real physical effects that responds well to proper diagnosis and treatment. The fatigue, the weakness, the cognitive fog, the cold, and the breathlessness are not things you have to accept or push through. They are symptoms of something treatable, and treating it properly changes how you feel in ways that are often dramatic.
The women’s health specialists at FunctionSmart Physical Therapy in San Diego, CA take the investigation and management of anemia seriously. We test thoroughly, identify the cause rather than just the symptom, and design treatment plans that address both repletion and the underlying factors driving the deficiency. Whether you are dealing with anemia for the first time or managing a pattern that keeps recurring, we will give you a clear picture of what is happening and what needs to change.
You have been tired for long enough. Call us today at 858-452-0282 to schedule your assessment and find out what is actually going on.