Hair loss affects millions of men and women every year, yet many people are told it is simply “genetic” or a normal part of aging. While genetics can absolutely play a role, hair thinning and shedding are often connected to deeper underlying issues involving hormones, inflammation, stress, nutrient deficiencies, metabolic dysfunction, and scalp health.

At Sheen Vein Aesthetics and Functional Medicine, we work with patients throughout St. Louis, Clayton, Chesterfield, Kirkwood, Arnold, Farmington, and Southern Illinois who are searching for answers to unexplained hair loss, thinning hair, or changes in hair quality. A functional medicine approach focuses on identifying possible root causes rather than only masking symptoms.

Hair Loss Is More Complex Than Most People Realize

Hair growth depends on proper blood flow, hormonal balance, nutrient delivery, mitochondrial energy production, and healthy hair follicle signaling. When these systems become disrupted, the hair growth cycle may shorten, leading to increased shedding or thinning.

The American Academy of Dermatology explains common causes of hair loss and how multiple medical and lifestyle factors can contribute to thinning hair in both men and women.

Common Root Causes of Hair Loss

1. Hormonal Imbalances

Hormones are one of the biggest contributors to hair thinning. In men, elevated dihydrotestosterone (DHT) sensitivity can shrink hair follicles over time. In women, menopause, thyroid dysfunction, PCOS, postpartum hormone changes, and testosterone imbalances may all contribute to shedding.

The Cleveland Clinic overview on hormonal hair loss discusses how hormone fluctuations can impact hair growth cycles.

2. Thyroid Dysfunction

Both hypothyroidism and hyperthyroidism can interfere with hair follicle function. Patients may notice diffuse thinning, brittle hair, fatigue, weight changes, brain fog, or dry skin occurring alongside hair loss.

According to the Mayo Clinic overview of thyroid disease, thyroid dysfunction can significantly affect metabolism, skin, and hair health.

3. Chronic Stress and Elevated Cortisol

Stress can push hair follicles into a resting phase known as telogen effluvium, leading to increased shedding weeks or months later. Chronic stress may also worsen inflammation and hormonal imbalance.

The American Academy of Dermatology explains stress-related hair loss and how emotional or physical stress can disrupt normal hair growth.

4. Nutrient Deficiencies

Hair follicles require adequate nutrients to function properly. Deficiencies in iron, vitamin D, zinc, protein, biotin, omega-3 fatty acids, and B vitamins may contribute to poor hair quality or increased shedding.

The National Institutes of Health vitamin D fact sheet highlights the important role vitamin D plays in overall health, including immune and cellular function.

5. Insulin Resistance and Inflammation

Metabolic dysfunction and chronic inflammation may impair circulation and cellular signaling within the scalp. Insulin resistance is also associated with hormonal shifts that can contribute to androgen-related hair thinning.

Harvard Health discusses inflammation and chronic disease here:
Harvard Health on chronic inflammation

Hair Loss in Women Is Often Overlooked

Many women are told their hair loss is “normal aging,” but female hair thinning can significantly impact confidence and emotional well-being. Hormonal fluctuations during perimenopause and menopause are common contributors, especially when combined with stress, poor sleep, inflammation, or nutrient depletion.

The American Academy of Dermatology on female pattern hair loss explains how hair thinning in women is more common than many people realize.

A Functional Medicine Approach to Hair Health

At Sheen Vein Aesthetics and Functional Medicine, we believe hair loss should not simply be dismissed as cosmetic. Our functional medicine approach focuses on identifying possible underlying contributors such as hormonal imbalance, thyroid dysfunction, inflammation, stress, gut health issues, nutrient deficiencies, and metabolic dysfunction.

Depending on the patient, evaluations may include hormone testing, metabolic screening, nutritional analysis, inflammatory markers, and lifestyle assessment to help better understand why hair thinning may be occurring.

Our goal is to help patients throughout the St. Louis area support healthier hair growth while also improving overall wellness, energy, and metabolic health.

If you are experiencing hair thinning, excessive shedding, or changes in hair quality, it may be time to look beyond genetics and evaluate possible root causes.

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