Hair loss happens when hair falls out faster than it grows. Common causes include genetic patterns, hormonal changes, inflammatory scalp conditions, medication effects, nutritional shortfalls and physical damage to the hair. We evaluate the pattern, timeline and scalp health to identify the cause and recommend appropriate treatment options.
What is hair loss and how we think about it
When people say hair loss they mean different things. Some notice gradual thinning across the crown. Others lose hair in distinct patches. Some see sudden shedding after an illness. As dermatologists we use precise terms so the problem is clear and the plan fits the cause.
Basic medical definitions
- Alopecia. Medical name for hair loss, used for any significant hair shedding or absence.
- Androgenetic alopecia. Pattern hair loss related to genetics and hormones.
- Telogen effluvium. Diffuse shedding that follows a trigger, often temporary.
- Anagen effluvium. Rapid hair loss during the growth phase, classically caused by certain medications.
- Scarring alopecia. Hair loss where inflammation destroys hair follicles and causes permanent loss.
Why hair loss causes matter for you in Newburgh and the Hudson Valley
Knowing the cause matters because treatments and outcomes differ widely. Some causes respond well to medical therapy or topical care. Some need lab testing or a scalp biopsy for a confident diagnosis. Local factors matter too. Seasonal stressors, regional fungal exposures and common medications prescribed by local practitioners shape what we see in Newburgh and the surrounding Hudson Valley.
At Greenblatt Henry A MD | Horizon Family Medical Group | Dermatology we aim to identify the cause efficiently so you understand realistic options and next steps.
Key concepts to understand about hair loss
- Pattern and timeline guide diagnosis. Where hair thins and how quickly it happened narrow the likely causes.
- Scalp health is central. Redness, scale or scarring point to inflammatory or infectious causes that require different management.
- Tests support clinical judgment. Blood tests, trichoscopy and scalp biopsy are tools we use when the cause is unclear.
- Treatment matches the cause. Some conditions need ongoing medical management. Others improve after an identifiable trigger resolves.
How we evaluate hair loss in clinic
We follow a reproducible process that balances thoroughness with practical care. Our goal is to explain what is likely causing your hair loss and offer options that align with your medical and cosmetic priorities.
- History and timeline. We review when the change began, recent illnesses or surgeries, medication use, pregnancies, major life stressors and family history of hair loss.
- Pattern exam. We examine the scalp for pattern thinning, discrete patches, inflammation, scaling and scarring. Photos are often helpful for tracking change over time.
- Trichoscopy or dermoscopy. Using a handheld scope we look at hair shaft and follicle features that help distinguish causes such as androgenetic alopecia, alopecia areata and tinea capitis.
- Targeted laboratory testing. When indicated we may recommend blood tests focused on thyroid function, iron status and other relevant measures.
- Scalp biopsy. If the diagnosis remains uncertain or scarring alopecia is suspected, a small biopsy can show the pattern of inflammation and guide definitive management. Learn more about when a biopsy is used in our skin biopsy guide.
Common causes of hair loss
Androgenetic alopecia, pattern hair loss
Genetics and hormone sensitive hair follicles produce a recognizable pattern of thinning. In men this often affects the temples and crown. In women it typically causes diffuse thinning with preservation of the frontal hairline. Medical options and cosmetic procedures can slow progression and improve appearance. For medical care that combines diagnosis and follow up see our dermatology service information.
Telogen effluvium, increased shedding after a trigger
Telogen effluvium causes diffuse shedding after events such as major illness, surgery, severe stress or certain medications. Shedding often starts a few months after the trigger and may be self limited, but evaluation for nutritional or hormonal contributors is important.
Alopecia areata, autoimmune patchy hair loss
Alopecia areata presents as sudden round patches of complete loss. It is an autoimmune condition that can be associated with other immune disorders. Treatments aim to limit progression and encourage regrowth.
Scarring alopecia and inflammatory scalp diseases
Conditions such as lichen planopilaris, central centrifugal cicatricial alopecia and discoid lupus can destroy hair follicles and cause permanent loss if untreated. Scalp inflammation, pain, burning or visible scarring are warning signs that warrant prompt dermatologic evaluation and sometimes a biopsy. Information about related scalp concerns is covered in our benign skin lesions and lesion removal options topics.
Infection and fungal causes
Tinea capitis is a fungal infection more common in children but seen in adults sometimes. It causes scaling, broken hairs and sometimes patchy hair loss. Identification and antifungal therapy are necessary to clear infection and prevent spread.
Medication related and anagen effluvium
Certain medications cause hair to stop growing or to break off rapidly. Classic examples include chemotherapy agents. When hair loss is medication related we coordinate with the prescribing clinician on timing and alternative strategies as appropriate.
Traction and physical damage
Tight hairstyles, chemical treatments and heat damage can cause progressive loss in areas under chronic tension. Early recognition and change in styling often help, but long standing traction can lead to permanent loss.
Comparison of common hair loss patterns
| Type | Typical pattern | Usual causes | Reversibility |
|---|---|---|---|
| Androgenetic alopecia | Gradual thinning, crown and frontal scalp | Genetics and hormones | Often manageable, regrowth variable |
| Telogen effluvium | Diffuse shedding | Illness, stress, medications, nutritional deficits | Often reversible once trigger is addressed |
| Alopecia areata | Round patchy loss | Autoimmune | Variable, many respond to treatment |
| Scarring alopecia | Patchy loss with scarring | Inflammatory diseases | Often permanent unless treated early |
Checklist: when to see a dermatologist about hair loss
Consider evaluation when you notice any of the following
- Rapid or sudden increase in hair shedding
- Patchy areas of complete hair loss
- Scalp redness, scaling, pain or scarring
- Associated symptoms such as weight changes, fatigue or other new medical issues
- Hair loss that affects your self confidence or daily life
What treatments and services are relevant
Treatment depends on the cause. Options include topical and oral medications, intralesional injections for certain inflammatory conditions, procedural dermatology for scarred areas, and cosmetic approaches to improve appearance. When scarring or an unusual lesion is suspected we may recommend biopsy or lesion evaluation. We provide medical and cosmetic care including cosmetic dermatology and scar revision guidance through our scar removal services.
For situations where nails or skin findings overlap with hair concerns, our nail condition treatment information and our general dermatology page describe our approach to diagnosis and follow up.
Scalp biopsy and targeted blood work are common tools we use to reach a clear diagnosis. A biopsy is a small, routinely performed procedure that helps guide treatment when the cause is not obvious from exam and history.
Key takeaway
Hair loss has many potential causes and the right care starts with pattern recognition, a focused history and a targeted exam. Early evaluation is especially important when the scalp is inflamed or when loss is rapid, because timely treatment can prevent permanent damage.
Frequently asked questions
How quickly do I need to see a dermatologist for hair loss?
If you have sudden widespread shedding, patchy complete loss, scalp pain or visible scarring, seek dermatologic evaluation promptly. Diffuse slow thinning can be evaluated on a routine basis but benefits from early assessment so reversible causes are not missed.
Can blood tests tell what is causing my hair loss?
Blood tests can identify contributing conditions such as thyroid disorders, iron deficiency and certain autoimmune markers. No single test diagnoses every cause. We use labs when the history or exam suggests a treatable systemic contributor.
Will hair always grow back after telogen effluvium?
Often telogen effluvium improves once the trigger resolves and hair regrowth occurs, but recovery can take months. We monitor progress and check for other contributing factors if regrowth is incomplete.
When is a scalp biopsy needed?
A biopsy is helpful when the diagnosis is unclear, when scarring alopecia is suspected, or when targeted tissue diagnosis will change management. It is a small procedure that yields information not visible on exam alone. Read more about when biopsies are used in our skin biopsy guide.
Are there cosmetic options if medical treatment does not fully restore hair?
Yes. Cosmetic dermatology and scar revision approaches can improve appearance. We review options that match your goals, including procedures and camouflage strategies described on our cosmetic dermatology page.
Learn more and check our local listing
Read patient reviews and get directions from our Google Business Profile, and explore related topics and services on our site to learn how we evaluate hair loss. For more about related skin concerns see our topics index and service pages.