Iron Deficient But Not Anemic? A Simple Solution for Fatigue

Struggling with an iron deficiency without anemia? The best way to see whether you have an iron deficiency is by measuring your level of ferritin, a protein found inside cells that stores iron so your body can use it later.

iron deficient

Anemia occurs when your blood can’t effectively carry oxygen to your cells. This develops when you have too few red blood cells or hemoglobin, the part of red blood cells that bind oxygen.

Even if you don’t have anemia, you could have an iron deficiency that’s sapping your energy. It’s entirely possible, especially if you’re a woman of reproductive age, to be iron-deficient without becoming fully anemic. When you’re iron-deficient but not anemic, you can still suffer from lower vitality, decreased immune function, poorer mental health, and impaired ability to perform physically and mentally.[1]

Iron deficiency is one of hundreds of causes of anemia, the most common blood condition in the U.S. It affects about 3.5 million Americans. Anemia occurs when your blood can’t effectively carry oxygen to your cells. This develops when you have too few red blood cells or hemoglobin, the part of red blood cells that bind oxygen. When your cells can’t get the oxygen they need, you experience chronic fatigue symptoms such as weakness, lethargy, and feeling sleepy all the time.

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Your Doctor May Not Be Ordering This Best Test

A study indicates that doctors may not be ordering the right test—and patients with chronic fatigue symptoms may therefore not be getting the right treatment—when it comes to iron deficiency.

The amount of ferritin in your blood (serum ferritin level) is directly related to the amount of iron stored in your body. With a ferritin deficiency, even one within the “normal” range, the more likely it is that you do not have enough iron.

However, most doctors don’t order this test. Instead, they may order only what is known as a  CBC, which stands for complete blood count, to check a patient’s red blood cell and hemoglobin levels. If the CBC, which is a simpler, less expensive test, comes back normal, the doctor may send the patient away without ordering a ferritin test and with no explanation for the patient’s fatigue.

Causes of Low Ferritin Research Findings

In a recent double-blind, placebo-controlled study, French and Swiss researchers decided to check low ferritin symptoms.[2] They wanted to see whether iron supplementation would help women with fatigue symptoms who had either low or “borderline” ferritin levels (<50 mcg/L) but were not anemic (meaning they had low iron, normal hemoglobin levels, >12 g/dL).

Interestingly, the “normal” reference range for ferritin in women is typically 18 to 160 mcg/L, but the researchers considered any level below 50 mcg/L to be borderline low.

The researchers randomly assigned 198 women with unexplained fatigue to take either 80 milligrams of iron a day (as sustained-release ferrous sulfate) or a placebo. Over 12 weeks, women on iron supplements noticed a significant improvement in their fatigue. On average, scores on a standard measure of fatigue fell by nearly half – from about 25 to 13, on a scale of zero to 40 – among women getting the extra iron.

Those in the placebo group also improved, but not as much as those in the iron group.[2] They concluded their study by stating that in “women with unexplained prolonged fatigue, iron deficiency should be considered when ferritin values are below 50 µg/L, even when hemoglobin values are above 12.0 g/dL.”

Why You Should Test First: Too Much Iron Is Dangerous

Other studies have also shown that low ferritin treatment or treatment of iron deficiency with either supplementation or a high iron diet results in improved mental health, increased energy, and decreased fatigue among women of childbearing age.[1,3]

But please be aware that it would be a mistake for you to take iron supplements or multivitamins with iron–thinking it will help your fatigue–without knowing if you are iron deficient in the first place. Studies have shown that excessive iron increases Alzheimer’s risk and can lead to serious health problems such as liver and heart disease.[4]

Iron Supplements: Do They Make a Difference?

We discuss in much more detail the dangers of too much iron in Part Two of this article. The ferrous sulfate used in the study cited above is the most commonly prescribed form of iron supplementation by conventional healthcare practitioners.

However, naturopathic physicians and other integrative healthcare practitioners trained in nutritional supplementation will often recommend other forms of supplemental iron which are better absorbed and cause less side effects in order to achieve normal iron levels. To learn more about these supplements and additional alternative remedies to fight fatigue symptoms, read Part Two of this article.


The conclusion to draw from this important study is that iron deficiency should always be considered as a possible underlying cause of your fatigue symptoms. However, because many doctors check only for anemia but not for low iron, this condition is commonly missed. Since too much iron is toxic and leads to serious health problems, you’ll want to absolutely know if you have low iron by checking your serum ferritin level before taking any iron supplements.

If your serum ferritin level is less than 50 mcg/L, use the suggestions found in Part Two to get your iron levels–and your energyback to normal.

Have you had your ferritin tested? Tell us about your experience in the comments section below.

[1] Patterson AJ, Brown WJ, Roberts DC. Dietary and supplement treatment of iron deficiency results in improvements in general health and fatigue in Australian women of childbearing age. J Am Coll Nutr. 2001 Aug;20(4):337-42.

[2] Vaucher P, Druais PL, Waldvogel S, Favrat B. Effect of iron supplementation on fatigue in nonanemic menstruating women with low ferritin: a randomized controlled trial. CMAJ. 2012 Jul 9. [Epub ahead of print] PubMed PMID: 22777991.

[3] Verdon F, et al. Iron supplementation for unexplained fatigue in non-anaemic women: double blind randomised placebo controlled trial. BMJ. 2003 May 24;326(7399):1124.

[4] Castellani RJ, Moreira PI, Perry G, Zhu X. The role of iron as a mediator of oxidative stress in Alzheimer disease. Biofactors. 2012 Mar-Apr;38(2):133-8.

Originally published in 2012 and updated.

  • Moriah M.

    I find plenty of good information on this website. Much thanks and hello from Germany!

  • This is exactly what happened to me. I had very low ferritin (below the reference range) and was told by my doctor that my fatigue couldn’t be because of iron since I didn’t have anemia and my saturation level was okay. He was wrong. I feel SO much better now that I’m supplementing.

  • Sharon H.

    My ferritin levels were tested and they were so far below the low average I was ready to cry….finally an answer to why I was so tired all of the time. I have restless legs as well and the sleep specialist I saw was the one who asked about my iron level. I told him I was never diagnosed as anemic but that’s when he said that isn’t the most accurate test for iron stores. I am now taking an iron supplement daily in an effort to raise my ferritin level to the normal range. Just had it tested after six months of daily supplements so I’m hoping for good things! I know it’s a slow process but if I see an increase, I’ll be very encouraged.

  • All well and good but I don’t want to be taking ferrous sulphate for the rest of my life I want to understand the cause of why my body is not storing iron… but the medical profession are not interested so what do I do now?

  • Yes! I have a platelet disorder and my ferritin is low often, but my hemoglobin is often normal. I’ve tested often enough to see the hemoglobin dip below a week later. Any time I’m seeing a new doctor I have to make them call my hematologist to confirm.

  • My mum was diagnosed with haemochromatosis so all of her children were tested, myself included. My brother ferritin levels were in the 400’s (mum’s in the 800’s) but my sister’s and mine were 30 and 25 retrospectively. We have not been diagnosed with anemia as they are just in the “normal” levels but a throw away comment was made that our levels were low but nothing to worry about. I have subsequently started to take iron supplements to bring my levels up and will receive annual checks for our ferritin levels.

  • Ngarita

    I have been diagnosed as being a chronic anaemic. I have had 2 blood transfusions and 1 Iron transfusion in the past 18 months. I’m about to have another Iron transfusion. It has been a process to get the last 2 treatments after ending up with breathlessness, fatigue, headaches etc in A & E and only being sent home because my hamagloblin came back normal. My breathlessness was a clear sign that something was wrong so I was gobsmacked I wasn’t initially going to receive any treatment. This time around I knew to say to check my Iron level and sure enough it came up low so I’ll be getting the needed transfusion. I know the signs and what to say so don’t let them ignore you if your hamaglobin levels are ok.

  • I am currently reading to see the hematologist. The doctor noted low ferritin a year ago and then also found and IGA deficiency that I had to be referred to a urologist for first. I am now just going to the hematologist because he had ferritin levels below, consistently between 6 and 9, and my iron is normal (66). My IBC & transferrin slightly high with 15% saturation. When I take iron supplements my iron is too high. I have so many blood tests and they’re quite consistent and so confusing! Has anyone else experienced this? I’m tired, my hairs been falling out for 2.5 years & now its so thin. I’m hoping for a simple answer soon!

  • I have had unbearable complete lethargy and exaustion all day every day. When i woke in the morning i felt truly like i was dying of terminal illness. It was unbearable. My ferretin is always low but at the very bottom of normal like 17 or recently 26. My irons usually normal though. Doctor told me to take iron. I started and i noticed an IMMEDIATE imptovement. I no longer wake up feeling like im going to die. It started helping within days. Now im wondering if my low fertetin has anything to do with my low neutrophils. They are always low. Sometimes within normal limits but always low % wise. Im wondering if by taking iron it’ll make them go up to normal again.

  • Emma P.

    My ferritin reserve score was 9, rather low I guess but my blood test score for iron was 11.5 . B12 was only 350 but my doctor didn’t think that was low. low levels cause neuropsychiatric problems like memory issues, lack of concentration, depression etc. which are becoming more frequent. Maybe it’s not due to my age, rather due to B12 and ferritin levels. Aren’t doctors supposed to know this stuff???

  • Carolyn

    My ferritin level was recently checked and was 6. I feel horrible, my heart is always racing, I’m exhausted, I can’t think straight, my head hurts and I get short of breath just getting up from a seated position. I’m a regular exerciser and this is the pits. I just want to cry. I started iron supplements 3 times a day a week ago and I don’t feel any better yet. Hoping to feel something next week… a small improvement would give me hope.

  • Julie

    I have had symptoms of light headedness, chills, extreme fatigue, and even chest pressure, pounding heart when climbimg stairs and depression. My ferritin levels are 9 and iron levels are normal. I had been feeling like this for years. After finding out I had low ferritin I started taking iron in liquid form. This was the only form that didn’t upset my stomach. Immidiately, I started feeling better. My energy level is so much better, no more lightheadedness and I feel really happy. I seems to imrpove depression too. I found that I had to eat things that help absorb the iron. Foods that have vitimin C and magnesium seem to help absorb the iron. I am so grateful that my doctor ordered the ferritin test. It was very helpful to read the other comments!

  • Susan H.

    I had been feeling terrible for some time. I went to the doctor two weeks ago. He suggested that I might not be getting enough exercise. The last thing I felt like doing was exercise, as I was so tired and fatigued. I asked him for blood tests. I actually said that I wanted everything tested, because I was feeling so terrible Fortunately, he had my iron level tested and it was found to be quite low. He said that I was either not absorbing iron properly anymore, or that I was not eating enough iron rich food. He suggested that I modify my diet and see if that works first. I am 65 years old and have never had this problem before. I am wondering whether it may be age related.


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