Low Ferritin: Symptoms, Causes, and Normal Levels
Ferritin is one of the most useful — and most overlooked — numbers on a blood test. It’s essentially your body’s iron savings account, and when it runs low, you can feel exhausted long before a standard blood count shows anything wrong. So what does low ferritin mean, what are the symptoms, and what counts as a normal level? Let’s decode it.
What is ferritin?
Ferritin is a protein that stores iron and releases it when your body needs it. Because of this, your blood ferritin level is the best single indicator of how much iron you have in reserve. Think of it as your iron “fuel tank”: when ferritin is low, your stores are running empty — even if the iron currently circulating in your blood still looks normal.
Normal ferritin levels chart
Ferritin is measured in nanograms per millilitre (ng/mL). Ranges differ between laboratories and between men and women, but the general guide is:
| Group | Typical normal range (ng/mL) | Considered low |
|---|---|---|
| Adult women | 15–150 | Below 30 |
| Adult men | 30–300 | Below 30 |
| Children | Varies by age | Interpreted by a doctor |
Here’s the key point many people miss: even a ferritin that is technically “within range” can be too low for you. Many doctors find that symptoms of iron deficiency appear when ferritin drops below about 30 ng/mL — and sometimes below 50. Always check your lab’s reference range and discuss your result with your doctor.
Can ferritin be low when your blood count is normal?
Yes — and this is one of the most common sources of confusion. Your body protects your haemoglobin (the oxygen-carrying part of your blood) until the very end, so it drains your iron stores first. This means you can have low ferritin and full-blown iron deficiency while your haemoglobin and “blood count” still look normal. This stage is called iron deficiency without anaemia, and it can absolutely make you feel unwell. It’s why a normal blood count doesn’t always rule out an iron problem.
Symptoms of low ferritin
- Persistent fatigue and low energy
- Feeling breathless or dizzy, especially on exertion
- Pale skin, brittle nails, or hair shedding
- Headaches and poor concentration (“brain fog”)
- Cold hands and feet
- Restless legs, or an unusual craving to chew ice
Iron isn’t the only common cause of unexplained tiredness — a low vitamin D level can feel remarkably similar. See our guide to vitamin D deficiency if fatigue is your main concern.
What causes low ferritin?
Low ferritin almost always comes down to one of three things: losing iron, not taking in enough, or not absorbing it well. Common causes include heavy menstrual periods, blood loss from the digestive tract, a diet low in iron (especially vegetarian or vegan diets without planning), pregnancy, and conditions that impair absorption such as coeliac disease. Because some causes — like hidden gastrointestinal bleeding — can be serious, finding the reason for low iron matters just as much as treating the number.
How to raise your ferritin
- Eat more iron-rich foods: red meat, liver, poultry, and fish (well absorbed), plus lentils, beans, tofu, and dark leafy greens.
- Pair iron with vitamin C: a source of vitamin C (citrus, peppers, tomatoes) at the same meal boosts absorption, while tea and coffee reduce it.
- Consider a supplement — with guidance: iron supplements work well but can cause side effects, and too much iron is harmful. Your doctor can advise the right dose and form, and recheck your level after a couple of months.
- Treat the cause: raising ferritin won’t last if the underlying reason (such as heavy bleeding) isn’t addressed.
What about high ferritin?
Ferritin can also be too high. Because it rises with inflammation, a high level can simply reflect infection or another illness — but it can also point to iron overload, liver conditions, or other issues. A persistently high ferritin should be reviewed by a doctor rather than ignored.
When should you see a doctor?
If your ferritin is low — or you have ongoing fatigue, breathlessness, or the symptoms above — see your doctor rather than simply buying iron tablets. Low ferritin is a clue, not a diagnosis, and your doctor’s job is to find why it’s low, rule out anything serious, and guide safe treatment. This is especially important if you have low iron without an obvious cause.
The bottom line
Ferritin reflects your body’s iron reserves, and a low level is one of the most common — and most treatable — reasons to feel exhausted. Because you can be iron-deficient with a normal blood count, ferritin is a number worth knowing. If yours is low, work with your doctor to find the cause and bring it back up safely.
This article is for general educational purposes only and is not a substitute for professional medical advice. Always consult your own doctor before starting supplements or making changes to your health routine. See our Medical Disclaimer for more information.