When Hair Loss Is Not Male Pattern Baldness: Other Causes

Reviewed by LPMD Medical Group cliniciansUpdated 2026-09-135 min read

The short answer

Male pattern baldness is gradual, symmetric thinning at the temples and crown with a normal-looking scalp. Hair loss that is sudden, patchy, diffuse all over, scaly, painful or scarred points to something else: alopecia areata, telogen effluvium after illness or stress, a scarring alopecia, scalp ringworm, thyroid disease, iron deficiency or a medication. Those need an in-person exam, often with blood tests or a scalp biopsy, because finasteride and minoxidil do not treat the cause.

Male pattern baldness is the celebrity of hair loss. It gets the ads, the forums, the pills and roughly all of the attention, which is fair, since it is the most common cause of hair loss in the world ¹. It is also why a man with a round smooth patch behind his ear, or handfuls of hair three months after a nasty flu, ends up ordering finasteride for a problem finasteride cannot touch.

We treat pattern loss. Part of taking the medicine seriously is knowing when the pattern is wrong.

Key facts

Male pattern baldness is gradual, symmetric thinning at the temples and crown over a normal-looking scalp; anything sudden, patchy, scaly, painful or all-over points elsewhere ¹⁸.
Alopecia areata is an immune attack on follicles that usually begins as a round or oval smooth bald patch, and hair often regrows and falls out again ¹².
Telogen effluvium is a diffuse shed starting about 1 to 6 months after a fever, illness, surgery, crash diet, thyroid problem, iron deficiency or new medication ³.
Scarring alopecias destroy follicles and replace them with scar tissue, so lost hair does not return and early treatment matters ¹⁴.
Ringworm of the scalp needs oral antifungal medicine for 4 to 8 weeks; shampoo alone does not cure it, and it can leave permanent loss ⁵.

How is male pattern baldness different from other hair loss?

Pattern loss follows a pattern. It is hereditary, it happens gradually with age, and it shows up as a receding hairline and a thinning crown while the sides and back keep their density ¹⁸. The scalp underneath looks like scalp: no scale, no redness, no pain.

Mayo Clinic lists the other pictures to watch for: circular or patchy bald spots, sudden loosening of hair in handfuls, hair loss all over the body, and patches of scaling that spread over the scalp ⁸. Mayo’s advice is to see a doctor for sudden or patchy loss or for more shedding than usual when combing or washing ⁸.

Condition	What it looks like	What usually confirms it
Male pattern baldness	Gradual temple and crown thinning, normal scalp ¹⁸	History, exam and pattern
Alopecia areata	Round or oval smooth bald patches, scalp or beard ²	Exam, sometimes biopsy
Telogen effluvium	Diffuse shedding 1 to 6 months after a trigger ³	History, pull test, blood tests
Scarring alopecia	Shiny patches with no pores, burning, itching, bumps ⁴	Scalp biopsy
Tinea capitis	Scaly inflamed patches, black dots, sometimes pus ⁵	Scraping, culture
Thyroid or iron	Even thinning all over, other body symptoms ¹⁶	Blood tests
Medication	Diffuse shed after a new drug ⁷⁸	History and timing

What is alopecia areata and how does it differ from balding?

Alopecia areata is a disease in which the immune system attacks hair follicles, and it usually announces itself as a round or oval bald patch on the scalp or beard with smooth skin underneath ¹². It most often starts in children and young adults but can begin at any age, and variants range from beard-only patches to total scalp or body hair loss ².

The course is different too. The AAD notes that hair can grow back, and some men have a single episode, but more often hair regrows and falls out again ². Because the mechanism is immune rather than hormonal, the treatments are different, and DHT blockers are not among them.

What is telogen effluvium?

Telogen effluvium is the body hitting pause on a large share of follicles at once. Normally about 85 percent of scalp hairs are growing and 15 percent resting; after a shock, many more shift into rest and shed together about 3 months later, with a range of 1 to 6 months ³. The shedding is diffuse rather than patterned, and the acute form lasts less than 6 months by definition ³.

The trigger list is long: high fever, severe infection, major surgery, serious trauma, crash dieting or low protein intake, hypothyroidism and iron deficiency ³. Medications are on it as well; StatPearls names beta-blockers, retinoids and excess vitamin A, anticoagulants, propylthiouracil and carbamazepine, and MedlinePlus adds calcium channel blockers, some antidepressants, NSAIDs and birth control pills ³⁷. Mayo Clinic adds drugs for cancer, arthritis, depression, heart problems, gout and high blood pressure ⁸.

A shed with a trigger usually recovers once the trigger is handled, but the trigger has to be found, which is a history-and-blood-test job. Do not stop a prescribed medicine on your own; ask whoever prescribed it.

What are scarring alopecias and why are they urgent?

Scarring, or cicatricial, alopecias are a group of conditions in which inflammation destroys the follicle itself. The AAD is blunt: once destroyed, a hair follicle cannot grow hair, because it has been replaced by scar tissue ¹⁴. Central centrifugal cicatricial alopecia, the most common scarring type in women of African descent, begins at the center of the scalp as a small round balding patch and can bring small bumps, burning, stinging or itching ⁴. Other scarring types affect men.

The clues are texture and sensation. A shiny smooth patch with no visible pore openings, scalp pain or burning, redness, pustules or crusting are not features of pattern loss. The AAD notes that early treatment can stop the spread and sometimes allow regrowth, so these symptoms should move you to an in-person dermatologist quickly rather than to a shampoo aisle ⁴. Diagnosis usually needs a scalp biopsy ⁷.

Can ringworm, thyroid disease or low iron cause hair loss in men?

Yes to all three. Ringworm of the scalp, tinea capitis, is a fungal infection that mostly affects children but can occur at any age and spreads by direct contact or shared combs and hats ⁵. It causes round scaly inflamed patches, bald areas with small black dots where hairs have broken off, sometimes pus-filled swellings, and itch ⁵. It needs oral antifungal medicine for 4 to 8 weeks; medicated shampoo helps but does not cure it, and it can leave permanent loss and scarring ⁵.

Thyroid disease produces diffuse thinning rather than a pattern. NIDDK lists dry, thinning hair alongside fatigue, weight gain, cold intolerance and depression as symptoms of hypothyroidism, and diagnosis rests on blood tests ⁶. The AAD adds that too little iron, protein, zinc or biotin can cause noticeable hair loss, and MedlinePlus lists anemia among causes a doctor may check with blood work ¹⁷. None of these responds to finasteride, so all-over thinning with any of those symptoms should get labs before a prescription; see the finasteride page for who it is actually for.

When to talk to a clinician

See a dermatologist in person, and soon, if you notice round or oval smooth bald patches; scaling, redness, pustules, crusts or black dots; scalp pain, burning or stinging; shiny areas with no visible pores; hair loss from eyebrows, beard or body; or hair coming out in handfuls a few months after an illness, surgery, crash diet or new medication ²³⁴⁵⁸. Fatigue, unexplained weight change or cold intolerance belong on the list too, since they point to a thyroid or nutritional cause that needs blood tests ⁶.

A chat consult can still be the first stop. Our clinicians will look at your photos and history, tell you whether the pattern fits, and point you to in-person care when it does not. A $45 consult that finds the boring kind is a good deal; one that finds something else is a better one.

Hairy questions, straight answers

How do I know if my hair loss is male pattern baldness or something else?

Male pattern baldness is slow, symmetric and patterned: receding temples, a thinning crown, a normal-looking scalp and no symptoms. Hair loss that arrives suddenly, falls out in round patches or handfuls, thins evenly all over including the sides and back, or comes with scaling, redness, pain or itching does not fit that picture and should be examined in person.

What does alopecia areata look like?

It usually begins as a round or oval bald patch on the scalp or beard with smooth skin underneath, and it can start at any age. The AAD notes hair often regrows, but it commonly falls out again in new patches. It is treated differently from male pattern baldness, so it needs a diagnosis rather than a finasteride prescription.

Can thyroid problems or low iron cause hair loss in men?

Yes. NIDDK lists dry, thinning hair among the symptoms of an underactive thyroid, and the AAD lists thyroid disease and deficiencies of iron, protein, zinc and biotin among causes of hair loss. Both are diagnosed with blood tests and the hair loss they cause is diffuse rather than patterned.

Which medications cause hair loss?

MedlinePlus lists retinoids, beta-blockers, calcium channel blockers, some antidepressants, NSAIDs and birth control pills as triggers of telogen effluvium, and Mayo Clinic adds drugs for cancer, arthritis, gout, depression, heart problems and high blood pressure. The shed usually begins one to a few months after starting the drug. Do not stop a prescribed medicine on your own; ask the prescriber.

Is scarring alopecia permanent?

Where inflammation has already destroyed follicles and replaced them with scar tissue, yes, that hair does not regrow. The AAD notes that starting treatment early can stop the process from spreading, which is why scalp pain, burning, redness or a shiny patch with no visible pores is an urgent reason to see a dermatologist in person.

Can a telehealth visit diagnose these other kinds of hair loss?

A chat consult can take a history, look at good photos and tell you whether your pattern fits male pattern baldness. When it does not, diagnosis usually needs hands and instruments: a pull test, a dermatoscope, a scraping or culture, blood tests or a scalp biopsy. Expect to be pointed to in-person dermatology for that.

Sources

Information checked 2026-09-13 by LPMD Medical Group clinicians. This article is general education, not a diagnosis or a treatment plan for you. Your clinician and pharmacist provide the instructions for your actual prescription.

How is male pattern baldness different from other hair loss?

What is alopecia areata and how does it differ from balding?

What is telogen effluvium?

What are scarring alopecias and why are they urgent?

Can ringworm, thyroid disease or low iron cause hair loss in men?

When to talk to a clinician

Hairy questions, straight answers

Sources

Further up the trail.

Male Pattern Baldness Explained: What DHT Actually Does

Hair Loss Myths: Hats, Stress, Shampoo and Your Grandfather

Shed Season: Why Hair Loss Can Look Worse When Treatment Starts