Adenomyosis, iron depletion and why fatigue deserves proper investigation.
Heavy Periods Can Affect More Than Your Cycle.
Heavy periods are often spoken about as an inconvenience. Something to plan around, push through, or quietly manage. But for many women+ living with adenomyosis, heavy bleeding can affect far more than the cycle itself. It can influence energy, concentration, mood, exercise capacity, sleep, work, relationships and overall quality of life. One of the most important reasons is iron depletion.
What is adenomyosis?
Adenomyosis occurs when endometrial-like tissue grows into the muscular wall of the uterus. This can make the uterus enlarged, tender and less able to contract normally during menstruation. Common symptoms include heavy or prolonged bleeding, painful periods, pelvic pressure, bloating, lower back pain and fatigue. Some people also experience bowel or bladder symptoms, which can make the condition harder to recognise.
Why heavy bleeding matters
When bleeding is heavy month after month, the body can lose more iron than it is able to replace. Iron is needed to make haemoglobin, which helps red blood cells carry oxygen around the body. But iron is also used in energy production, muscle function, brain health and immune regulation. This means low iron stores can affect how someone feels long before anaemia becomes obvious on standard blood tests.
Iron deficiency can happen before anaemia
A common misconception is that iron is only a concern when haemoglobin is low. In reality, ferritin, which reflects stored iron, can drop first. This is sometimes called iron deficiency without anaemia. Symptoms may still be significant, even when haemoglobin is technically in range. For people with adenomyosis and heavy menstrual bleeding, checking iron stores can be just as important as investigating the bleeding itself.
Symptoms that may point to low iron
Iron depletion can feel like more than ordinary tiredness. Symptoms may include persistent fatigue, dizziness, shortness of breath with exertion, poor concentration, headaches, restless legs, hair shedding, heart palpitations, feeling unusually flat or reduced exercise tolerance. These symptoms are often brushed off as stress, parenting, work demands or being busy. But if heavy bleeding is part of the picture, iron status deserves attention.
Why this is often missed
Adenomyosis is still under-recognised, and heavy bleeding is too often normalised. Many people are told that painful or heavy periods are simply part of life, especially if they have had symptoms for years. This can delay both diagnosis and treatment. The result is that patients may spend years managing exhaustion without anyone connecting the dots between uterine bleeding, iron depletion and daily function.
What assessment may involve
A thorough assessment may include a detailed menstrual history, pelvic examination where appropriate, pelvic ultrasound, and in some cases MRI. Blood testing may include a full blood count and iron studies, including ferritin and transferrin saturation. The goal is to understand both the cause of the bleeding and the impact it is having on the whole body.
Supporting both the bleeding and the depletion
Managing iron depletion without addressing heavy bleeding can lead to a cycle of temporary improvement followed by recurrence. A comprehensive care plan may involve treating the adenomyosis, reducing menstrual blood loss, restoring iron stores and supporting overall wellbeing. Depending on the person, options may include hormonal therapies, anti-inflammatory strategies, iron supplementation or infusion where appropriate, surgical options in selected cases, and multidisciplinary support.
The Elgin House approach
At Elgin House, we take heavy periods seriously because they can affect the whole person. Our team considers the structural, hormonal, inflammatory and nutritional factors that may be contributing to symptoms. If adenomyosis is suspected, or if periods are leaving you depleted every month, you deserve care that looks deeper than the cycle alone.
When to seek support
It may be worth seeking support if your period regularly soaks through pads or tampons quickly, lasts longer than usual, includes large clots, causes severe pain, leaves you exhausted, or affects your ability to work, exercise or function normally. Heavy bleeding is common, but it should not be dismissed. If your period is draining your energy, there may be more going on.
References
RANZCOG. Heavy Menstrual Bleeding patient information. Notes that adenomyosis can contribute to heavy menstrual bleeding and that heavy bleeding can reduce iron levels.
Australian Commission on Safety and Quality in Health Care. Heavy Menstrual Bleeding Clinical Care Standard, 2024. Includes indicators for testing iron deficiency and anaemia in patients with heavy menstrual bleeding.
Munro MG et al. The relationship between heavy menstrual bleeding, iron deficiency, and iron deficiency anaemia. American Journal of Obstetrics and Gynecology, 2023.
Jean Hailes for Women's Health. Adenomyosis health information. Describes heavy periods, pelvic pain and iron deficiency anaemia related to adenomyosis.
Kawamata M et al. Characteristics of transferrin saturation and anaemia-related markers in women with uterine adenomyosis. PLOS ONE, 2026.
RANZCOG and Endometriosis Foundation of Australia. Australian clinical practice guideline for the diagnosis and management of endometriosis, 2021. Includes adenomyosis prevalence and diagnostic considerations.