A growing number of women are experiencing hair loss, with online searches in the UK for related terms having more than doubled since 2021, according to a UK general practitioner. While factors such as weight-loss medications and menopause are frequently cited as causes, the doctor suggests that a common yet often overlooked deficiency—low iron levels—is the primary culprit.
Hair loss is a normal part of aging for many, with an estimated eight million women in the UK experiencing some form of it. By post-menopause, half of women may experience female pattern hair loss. However, this does not account for the observed increase in the trend. Some experts attribute the rise to the widespread use of weight-loss drugs like Mounjaro and Wegovy, which are used by 2.5 million Britons, predominantly women. Although hair loss is a known side effect of rapid weight loss, the sheer volume of women affected suggests these drugs are not the sole reason.
Instead, the physician believes low iron levels are a significant factor. Iron is essential for transporting oxygen throughout the body. Iron-deficient individuals may experience shortness of breath, heart palpitations, and fatigue, but hair loss can sometimes be the only symptom. It is theorized that when iron levels are low, the body prioritizes oxygen delivery to vital organs, diverting it from hair follicles.
Iron deficiency has historically been a common issue for women, affecting about one in ten British females, often due to heavy menstrual periods. However, poor diet can also trigger this deficiency. The rise in vegetarian and vegan diets among young women, particularly those who also avoid dairy, may lead to insufficient iron intake if not carefully managed. This dietary shift could be a key reason behind the surge in hair problems among women.
The doctor advises any woman experiencing hair loss to request a ferritin blood test from their general practitioner. This test measures the body's stored iron reserves. Treatment for diagnosed iron deficiency typically involves iron supplements, which can improve ferritin levels within weeks. However, visible hair regrowth may take three to six months of consistent supplementation. Some individuals experience side effects like cramping and nausea from iron tablets, but taking them every other day, rather than daily, is often better tolerated and equally effective.
Iron deficiency is not the only cause of hair loss. It can also be an early indicator of menopause, as declining estrogen levels can affect hair. Hormone replacement therapy can often improve thinning hair. Estrogen also decreases during breastfeeding, leading many new mothers to notice increased hair shedding. An underactive thyroid is another common cause, where slowed metabolism can lead to thinning hair, fatigue, constipation, low mood, and weight gain. Daily thyroxine tablets typically restore normal hair growth.
Scalp conditions such as dermatitis or psoriasis can also contribute to hair loss and should be checked by a GP. Sudden, patchy bald spots or very rapid hair loss accompanied by other concerning symptoms like unexplained weight loss, fevers, or feeling generally unwell require urgent medical attention, as these could, in rare cases, indicate cancer.
For most women, the outlook is positive. Hair loss is common, usually explainable, and often treatable once the correct diagnosis is made through appropriate testing.