Low Ferritin and Perimenopause: Is There a Link with Progesterone?
If you're experiencing perimenopause symptoms such as fatigue, brain fog, low energy or feeling unlike yourself, you may have started looking more closely at your hormones and blood tests.
Two terms that often come up are progesterone and ferritin. But is there a link between the two?
The relationship is more nuanced than simply saying that low progesterone causes low ferritin.
Instead, the connection is often related to the changes that happen to your menstrual cycle during perimenopause.
What is ferritin?
Ferritin is a protein that stores iron in the body. A ferritin blood test can provide an indication of your body's iron stores.
Iron is essential for producing haemoglobin, which carries oxygen around the body. Iron deficiency can cause symptoms including tiredness, lack of energy, headaches, shortness of breath, palpitations and difficulty concentrating.
Importantly, iron deficiency and anaemia are not necessarily the same thing. Iron stores can become depleted before iron-deficiency anaemia develops.
What happens to progesterone during perimenopause?
Progesterone rises after ovulation and plays an important role in the second half of the menstrual cycle.
During perimenopause, ovulation can become less predictable. As a result, progesterone production can fluctuate.
At the same time, periods often change. They may become heavier, lighter, longer, shorter or more irregular. Changes in menstrual bleeding are a common feature of perimenopause.
Can low progesterone cause low ferritin?
Not directly.
There is not strong evidence that low progesterone itself causes low ferritin.
However, hormonal changes during perimenopause can contribute to changes in menstrual bleeding. If periods become heavier or last longer, you may lose more blood — and therefore more iron.
Over time, this can contribute to depleted iron stores and a lower ferritin level.
The relationship is therefore better understood as:
Perimenopausal hormonal changes → changes in menstrual bleeding → increased blood loss → increased iron loss → potentially lower ferritin
This can be particularly relevant if you have noticed that your periods have become significantly heavier during perimenopause.
Why does this matter?
Fatigue and brain fog are common reasons women seek help during perimenopause, but these symptoms can have several possible causes.
Hormonal changes, disrupted sleep, stress and iron deficiency can all contribute to feeling exhausted or unable to concentrate.
This means it's worth looking beyond the assumption that “it's just menopause.”
If you have developed heavier periods alongside persistent fatigue, it is worth discussing this with your GP.
The NHS identifies heavy periods as a common cause of iron-deficiency anaemia, and recommends speaking to your GP if heavy bleeding is affecting your daily life or if you have concerns about your symptoms.
Can nutrition support iron levels?
Nutrition can play an important role in supporting iron intake.
Good sources of iron include:
red meat
fish and poultry
beans, lentils and chickpeas
tofu
nuts and seeds
leafy green vegetables
fortified breakfast cereals
dried fruit
The NHS recommends a varied, balanced diet containing iron-rich foods and notes that women who experience heavy periods are at greater risk of iron-deficiency anaemia.
Vitamin C can also help with the absorption of iron from plant-based foods, so including foods such as peppers, berries, citrus fruits, tomatoes and broccoli alongside iron-containing foods can be useful.
However, diet alone may not be enough to correct iron deficiency, particularly when there is ongoing blood loss. If you have been prescribed iron supplements, follow your GP or healthcare professional's advice.
Do I need a progesterone blood test?
Not necessarily.
For women aged 45 and over with typical symptoms, NICE recommends identifying perimenopause based on symptoms and changes to the menstrual cycle rather than routinely using hormone blood tests. Hormone levels can fluctuate considerably during this stage of life.
This means that a single progesterone result may not provide a meaningful picture of what is happening during perimenopause.
Instead, your symptoms, menstrual history and overall health are important pieces of the picture.
When should you speak to your GP?
Speak to your GP if:
your periods have become significantly heavier
your periods last longer than seven days
you feel persistently tired or short of breath
you have concerns about iron deficiency
you are bleeding between periods or after sex
your periods are affecting your quality of life
Heavy periods can have several causes and shouldn't simply be dismissed as part of getting older or going through menopause.
If you have gone through menopause and subsequently experience any vaginal bleeding, this should also be assessed by your GP.
The bottom line
There isn't a simple relationship between low progesterone and low ferritin.
However, the hormonal changes of perimenopause can alter menstrual bleeding. For some women, heavier or prolonged periods can increase iron loss and gradually deplete iron stores.
If you're experiencing fatigue, brain fog, low energy or heavier periods, it can therefore be helpful to consider your iron status alongside the wider picture of perimenopause.
At Nurture Therapies Alexia can help you assess your diet, iron intake and overall nutritional needs during midlife, while your GP can investigate persistent symptoms, heavy bleeding or possible iron deficiency.
Perimenopause is a time of significant change — but feeling exhausted and unwell shouldn't simply be something you are expected to put up with.
References
NHS. Iron deficiency anaemia. NHS – Iron deficiency anaemia
NHS. Heavy periods. NHS – Heavy periods
NHS. Symptoms of menopause and perimenopause. NHS – Menopause and perimenopause symptoms
NHS. Iron – vitamins and minerals. NHS – Iron
NICE. Menopause: identification and management (NG23). NICE – Menopause: identification and management
