A dermatologist is the best starting point for most types of hair loss. Dermatologists are board-certified physicians trained to diagnose and treat conditions of the skin, hair, and nails, and they have access to the full range of diagnostic tools and prescription treatments. That said, hair loss sometimes points to an underlying condition that involves other specialists, so knowing who does what can save you time and get you to the right care faster.
Start With a Dermatologist
Dermatologists are the default specialists for hair loss because they can both diagnose the cause and manage treatment. During your visit, the dermatologist will examine your scalp closely, looking at the pattern of thinning, the condition of your skin, and even your nails (which can reveal clues about autoimmune or nutritional issues). They’ll also perform a pull test, gently tugging on a small section of hair to assess how easily strands come loose, which tells them whether your hair is actively shedding and how fragile the follicles are.
If the visual exam isn’t enough, a dermatologist can order blood work or perform a scalp biopsy. The biopsy involves removing a tiny 4mm circle of scalp tissue and sending it to a lab. This is particularly important for scarring types of hair loss, where the follicle is being permanently destroyed, because those conditions need to be identified and treated quickly before the loss becomes irreversible. For more common types like pattern baldness or stress-related shedding, a biopsy is rarely needed.
Blood Tests That Identify the Cause
Hair loss is often a symptom, not a standalone condition. Your dermatologist or primary care doctor can order blood tests to check for the most common hidden causes:
- Iron and ferritin: Iron helps carry oxygen to hair follicles. Low ferritin (your body’s stored iron) is a well-known trigger for a type of shedding called telogen effluvium, where large amounts of hair fall out a few months after the body is stressed or depleted.
- Thyroid-stimulating hormone (TSH): Both an overactive and underactive thyroid can cause hair thinning. A simple TSH test can flag either one.
- Vitamin D and B12: Vitamin D deficiency has been linked to alopecia areata, a condition where the immune system attacks hair follicles. B12 deficiency can also contribute to thinning.
- Sex hormones: Testosterone, estrogen, and a hormone called DHT play a direct role in pattern hair loss. In women, these tests can also reveal polycystic ovary syndrome (PCOS), a hormonal condition that frequently causes thinning on the scalp.
- Complete blood count (CBC): This general screening catches anemia and other blood-related issues that could be starving your follicles of nutrients.
Getting these results early shapes the entire treatment plan. If your hair loss is driven by low iron or a thyroid problem, fixing the underlying issue often restores growth without any hair-specific treatment at all.
When You Might Need an Endocrinologist
If blood work reveals a hormonal imbalance, your dermatologist may refer you to an endocrinologist, a doctor who specializes in the body’s hormone-producing glands. This is especially relevant for women experiencing hair thinning alongside irregular periods, acne, or excess body hair, all of which can signal elevated androgen levels. About 75% of people with abnormally high androgens develop noticeable changes in hair growth patterns.
Androgens are the primary regulators of hair growth, and when levels are off, scalp hair gets progressively thinner while body and facial hair may increase. Hair changes can actually be the first visible sign of a hidden hormonal disorder, which is why an endocrinologist’s evaluation matters. They can fine-tune hormone management in a way a dermatologist typically won’t.
The Role of a Rheumatologist
If your hair loss appears in distinct round patches rather than a gradual thinning pattern, or if you have a personal or family history of autoimmune diseases like lupus, type 1 diabetes, or thyroid disease, a rheumatologist may be part of your care team. Alopecia areata is an autoimmune condition, and it sometimes coexists with other autoimmune disorders that a rheumatologist is better equipped to manage.
Your dermatologist will typically handle the hair loss itself, but a rheumatologist can evaluate whether a broader autoimmune process is at play and coordinate treatment for the whole picture.
Trichologists: What They Can and Can’t Do
You may come across trichologists during your search. These are hair and scalp specialists, but they are not physicians. They don’t hold medical degrees and can’t prescribe medication, order blood tests, or perform biopsies. Their training focuses on the cosmetic aspects of hair care, and their scope is limited to non-medical assessment and over-the-counter recommendations.
A trichologist might be helpful if you’re dealing with breakage, styling damage, or scalp irritation from products. But for actual hair loss, where follicles are shrinking or the immune system is involved, you need a medically qualified professional. The distinction matters because some trichology practices operate with a primarily commercial interest, and a consultation fee there could delay you from getting the diagnostic work that actually identifies your problem.
What Treatments Are Available
The treatments your specialist recommends depend entirely on the type and cause of your hair loss. For androgenetic alopecia (pattern baldness, the most common type in both men and women), three treatments currently have FDA approval: topical minoxidil, oral finasteride, and low-level light therapy. Beyond those, dermatologists may also use platelet-rich plasma injections, hormonal therapies, or nutritional supplements depending on your situation.
For alopecia areata, treatment looks different. Mild cases involving less than 50% of scalp hair are typically treated with topical or injected anti-inflammatory medications. More extensive cases may now be treated with a newer class of drugs called JAK inhibitors, which work by calming the immune response that’s attacking the follicles. Insurance is more likely to cover treatment for alopecia areata when it meets medical necessity criteria, while pattern baldness treatments are usually considered cosmetic and paid out of pocket.
Identifying Your Type of Hair Loss
Before your appointment, it helps to notice a few things about your hair loss pattern. Doctors use standardized scales to classify what they see. In men, the Norwood scale tracks hair loss from early recession at the temples (types I through III) to extensive balding across the crown (types IV through VIII). In women, the Ludwig scale measures diffuse thinning on top of the head in three grades, from barely perceptible thinning to full baldness in the affected area.
Take note of whether your hair is thinning gradually or falling out in clumps, whether you see smooth bald patches or an overall reduction in density, and whether your scalp looks red, flaky, or scarred in the affected areas. Also note when the loss started and whether anything changed around that time: a major illness, surgery, pregnancy, new medication, or period of intense stress. All of this information helps your specialist narrow the diagnosis quickly.
How to Prepare for Your First Visit
Arrive with a list of all medications and supplements you currently take, since several common drugs can trigger hair shedding. Bring photos showing how your hair looked before the loss started if you have them. Two questions worth asking at your appointment: whether your condition is likely temporary or long-term, and what realistic timeline you should expect for improvement. Most hair loss treatments take three to six months to show visible results, and setting that expectation early prevents frustration.
If you don’t have a dermatologist, your primary care doctor is a reasonable first step. They can run the initial blood panels, rule out thyroid or nutritional causes, and refer you to the right specialist based on what they find. For many people, that initial workup reveals a treatable cause, and the hair loss resolves once it’s addressed.