Hair Loss

3 min read·Last updated: 2026-02-08·Reviewed by Dr. Julia Tzu, MD, FAAD, FACMS

At a Glance

Hair loss, medically known as alopecia, is a common condition affecting millions of people worldwide. Androgenetic alopecia (hereditary hair loss) is the most common type, affecting an estimated 80 million people in the United States. In this condition, inherited genes cause hair follicles to shrink and eventually stop producing hair. Men typically experience a receding hairline and bald spots, while women usually notice overall thinning or a widening part. Hair loss can begin as early as the teens but more commonly starts later in life. Early diagnosis and treatment can help slow hair loss and, in some cases, stimulate regrowth.

Androgenetic alopecia affects an estimated 80 million people in the United States[1]
Early treatment can help prevent hair follicles from shrinking, making restoration more effective[6]
Minoxidil has been shown to reduce hair loss, stimulate hair growth, and strengthen existing hair[1]
Female pattern baldness is often reversible with treatment including medications and laser therapy[2]

Symptoms

Gradual thinning on top of head
Receding hairline (common in men)
Widening part (common in women)
Circular or patchy bald spots
Increased hair shedding
Smaller, finer hair strands over time
Bald spot at crown of head (men)
Overall decreased hair density

When to Seek Professional Care

Noticeable increase in hair shedding
Receding hairline or thinning areas
Patchy or sudden hair loss
Hair loss after starting new medication
Hair loss accompanied by other symptoms
Desire to explore treatment options early

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Causes

Hereditary factors (androgenetic alopecia)
Hormonal changes (pregnancy, menopause, thyroid)
Medical conditions (alopecia areata, infections, hypothyroidism)
Medications and treatments
Stress (telogen effluvium)
Nutritional deficiencies
Hairstyling damage (traction alopecia)
Aging

How We Can Help

We offer a service to help manage this condition: Hair Loss Treatment.

Prognosis

Early treatment yields better results
Medications can slow hair loss and stimulate regrowth
Continuous treatment needed to maintain results
Hair transplants can provide lasting improvement
Once follicles shrink significantly, restoration may be limited
Female pattern hair loss is often reversible with treatment

Frequently Asked Questions

What causes hair loss?

The most common cause is hereditary hair loss (androgenetic alopecia), where inherited genes cause follicles to shrink over time. Other causes include hormonal changes, medical conditions, medications, stress, and nutritional deficiencies. The specific cause determines the best treatment approach.

How does hair loss differ between men and women?

Men typically experience a receding hairline and bald spot at the crown. Women usually notice overall thinning or a widening part, rarely developing complete baldness. Female pattern hair loss often begins after menopause. Both conditions result from genetic factors affecting hair follicles.

When should I see a dermatologist about hair loss?

See a dermatologist at the first signs of increased shedding or thinning. Early treatment yields the best results because it's easier to maintain existing hair than regrow lost hair. Also seek evaluation for sudden, patchy, or rapid hair loss, which may indicate underlying conditions.

What treatments are available for hair loss?

Treatments include topical minoxidil (over-the-counter), oral finasteride (prescription), mesotherapy (scalp injections) with minoxidil or dutasteride, platelet-rich plasma (PRP) therapy, low-level laser therapy, and hair transplant surgery. Women may also use spironolactone. Treatment must usually be continued to maintain results.

Is hair loss reversible?

It depends on the cause and timing. Early hereditary hair loss may respond to medications that slow loss and stimulate regrowth. However, once follicles have significantly shrunk, restoration becomes more limited. This is why early treatment is recommended.

Can hair loss be prevented?

Hereditary hair loss cannot be fully prevented, but early treatment can slow its progression. General hair health tips include eating a balanced diet, managing stress, avoiding tight hairstyles that pull on hair, and treating underlying medical conditions promptly.

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Sources & References

This article draws from 6 peer-reviewed sources.

Medical Institutions

Educational & General

Medically reviewed by Dr. Julia Tzu, MD, FAAD, FACMS · Last reviewed: 2026-02-08