A dermatologist is the best first doctor to see for hair loss. Dermatologists are trained in the anatomy, physiology, and diseases of hair and scalp, and they can diagnose the full range of conditions that cause thinning or shedding. Depending on what they find, you may also be referred to other specialists.
Why a Dermatologist Is the Go-To Specialist
Dermatologists complete medical school, a residency in skin conditions, and often additional fellowship training specifically in hair disorders. That training covers both the medical and surgical sides of hair loss, from pattern baldness and autoimmune conditions to scarring diseases of the scalp. They can prescribe medications, perform scalp biopsies, and use specialized tools like a dermatoscope (essentially a magnifying lens with polarized light) to examine individual hair follicles without cutting anything.
During your visit, a dermatologist will typically examine your scalp, gently tug on a small section of hair to see how easily it sheds, and may take a small scalp sample if the cause isn’t obvious from a visual exam. They’ll also order blood work when they suspect an internal cause. A standard panel for hair loss often includes iron and ferritin levels, thyroid function, vitamin B12, folate, and sometimes hormone levels like testosterone and estrogen. In one study of women with pattern hair loss, about 25% had ferritin levels too low to support a normal hair cycle, even though they weren’t technically anemic.
When You Might Need an Endocrinologist
If your hair loss is tied to a hormonal problem, your dermatologist will likely refer you to an endocrinologist. Thyroid disorders are one of the most common hormonal culprits: roughly 50% of people with an overactive thyroid and 33% of people with an underactive thyroid experience diffuse hair shedding. Other hormonal conditions linked to hair changes include polycystic ovary syndrome (PCOS), Cushing’s disease, and abnormally high androgen levels.
Signs that a hormonal issue might be driving your hair loss include irregular periods, new or unusual facial hair growth, unexplained weight changes, or fatigue that doesn’t improve with rest. Hair changes can actually be the first visible sign of a hidden hormonal condition, so they’re worth investigating even if they seem minor. If blood work reveals hormonal irregularities, your dermatologist may send you to an endocrinologist or gynecologist for further evaluation and treatment of the underlying cause.
When Hair Loss Points to Autoimmune Disease
Alopecia areata, which causes smooth round patches of hair loss, is an autoimmune condition most commonly associated with thyroid disease and vitiligo. But it has also been linked to lupus, rheumatoid arthritis, and diabetes. In some cases, patchy hair loss is what leads to the discovery of a systemic autoimmune disease that hadn’t been diagnosed yet.
In one documented case, a woman presented with alopecia areata and further lab work uncovered systemic lupus erythematosus. She was referred to a rheumatologist who confirmed the diagnosis. Non-scarring hair loss was actually added to the diagnostic criteria for lupus in 2012. When a dermatologist sees new-onset alopecia areata, they may run a broader autoimmune panel, checking for markers like antinuclear antibodies, rheumatoid factor, and blood sugar levels alongside the standard thyroid tests. If results suggest a systemic condition, a rheumatologist becomes part of your care team.
Hair Loss in Children
Children lose hair for different reasons than adults. The most common cause is a fungal scalp infection called tinea capitis, which accounts for about 40% of childhood hair loss cases. Alopecia areata is next at around 26%, followed by telogen effluvium (temporary shedding after illness or stress) at about 18%. Traction alopecia from tight hairstyles and trichotillomania (hair pulling) are also seen regularly.
A pediatric dermatologist is the ideal specialist for children, though a general pediatrician can handle straightforward cases like fungal infections. Trichotillomania is a special situation: because it’s tied to psychological factors, a child with this condition typically benefits from seeing both a dermatologist and a psychologist. Less commonly, childhood hair loss can signal thyroid problems, iron deficiency, or other internal conditions, so blood work may be warranted if the cause isn’t immediately clear.
Dermatologist vs. Trichologist
You may come across trichologists while searching for hair loss help. It’s important to understand the difference. Trichologists are not medical doctors. They study hair and scalp care but cannot prescribe medications, order blood tests, or perform biopsies. Their role focuses more on the cosmetic aspects of hair health. Some are knowledgeable and helpful for styling-related damage or general scalp care, but they can’t diagnose or treat medical conditions causing hair loss.
The term “dermatotrichologist” was proposed in 2010 to distinguish board-certified dermatologists who specialize in hair disorders from non-medical trichologists. If you’re experiencing real hair thinning or shedding, start with a physician who can run diagnostics and prescribe treatment.
Choosing a Hair Transplant Surgeon
If your hair loss has progressed to the point where you’re considering surgical restoration, look for a surgeon who is a diplomate of the American Board of Hair Restoration Surgery (ABHRS). This designation means the surgeon has passed a specialized examination and demonstrated a high level of knowledge in hair restoration procedures. ABHRS diplomates are required to display their credentials clearly on their websites and marketing materials, so this is something you can verify before booking a consultation. Hair transplant surgeons come from various medical backgrounds, including dermatology and plastic surgery, but the ABHRS credential specifically validates their expertise in hair restoration.
Insurance Coverage for Hair Loss Treatment
Coverage depends heavily on the cause. Many insurance formularies explicitly exclude medications prescribed for cosmetic or hair loss purposes. Pattern baldness treatments are almost always classified as cosmetic and denied. Even commonly prescribed hair loss medications that are covered for other conditions (oral minoxidil, for instance, is typically covered when prescribed for cardiovascular issues) may be denied when the indication is hair loss.
Hair loss caused by a documented medical condition like alopecia areata, lupus, or thyroid disease has a better chance of coverage, though appeals are often necessary. If your dermatologist identifies an underlying medical cause, having that diagnosis on your records strengthens any insurance claim.
How to Prepare for Your First Appointment
You don’t need to stop washing your hair or avoid products before your visit. Northwestern Medicine’s hair loss clinic specifically states that no special preparation is required, though certain hairstyles or heavy product use might mean you’ll need a follow-up for a more detailed scalp evaluation.
What does help is bringing a list of all current and past medications, any relevant lab results or biopsy reports you already have, and a timeline of when you first noticed changes. Think about whether the loss was sudden or gradual, whether it followed a stressful event, illness, surgery, or medication change, and whether anyone in your family has experienced similar thinning. Note any other symptoms you’ve had, even ones that seem unrelated, like fatigue, weight changes, or joint pain. These details help your doctor narrow down the cause faster and decide which tests to order.