Hair fall is one of the most common concerns that brings patients to a dermatology clinic. It is also one of the conditions most prone to anxiety — and to misinformation. Many people come in convinced they are going bald when their shedding is entirely normal. Others wait years before seeking help for a condition that responds well to early treatment.
Understanding the difference between normal shedding and pathological hair loss can help you decide when to monitor, when to act, and when to see a dermatologist.
Normal Hair Shedding
The average scalp has approximately 100,000 hair follicles. At any given time, most follicles are in the active growth phase (anagen), which lasts 2–6 years. A small percentage are in the transitional phase (catagen) or the resting phase (telogen), after which the hair sheds and the cycle restarts.
It is entirely normal to shed 50–100 hairs per day. If you are washing your hair less frequently, you may notice more hairs in the shower on wash days — this is accumulated shedding, not increased loss.
Factors that make normal shedding more noticeable:
- Long hair (longer hairs are more visible when shed)
- Washing infrequently (accumulated shedding appears in one go)
- Seasonal changes (slight increase in shedding is normal in autumn for some people)
- Recent changes in styling habits (more brushing, or less)
Types of Pathological Hair Loss
When hair loss exceeds normal limits or produces visible thinning, it falls into several categories:
1. Telogen Effluvium (TE)
Telogen effluvium is diffuse hair shedding that occurs 2–3 months after a significant physiological or psychological stressor. The stressor “pushes” a large proportion of growing hairs into the resting (telogen) phase simultaneously, leading to increased shedding when those hairs shed 2–3 months later.
Common triggers include:
- Major illness or surgery
- Significant weight loss (crash diets)
- Nutritional deficiencies (iron, vitamin D, protein)
- Childbirth (post-partum hair loss is very common)
- Thyroid disorders
- Severe emotional stress
- COVID-19 infection
What it looks like: Diffuse thinning across the scalp, often with handfuls of hair visible in the shower or brush. The hair part may appear wider.
What to do: Identifying and addressing the underlying cause is the priority. Most cases of telogen effluvium resolve spontaneously within 6–12 months once the trigger is removed. However, investigations to rule out nutritional deficiencies and thyroid disorders are important.
2. Androgenetic Alopecia (Male/Female Pattern Hair Loss)
Androgenetic alopecia is the most common cause of progressive hair loss. It is influenced by genetic predisposition and the effects of androgens (male hormones, present in both sexes) on susceptible hair follicles.
In men: Typically begins with recession at the temples and/or thinning at the crown. The pattern is classified using the Norwood scale.
In women: More diffuse thinning across the central scalp, with preservation of the hairline in most cases. Classified using the Ludwig scale.
When it appears: Can begin in the 20s, 30s, or later. Family history on either side (maternal or paternal) is a risk factor.
Why it matters: Androgenetic alopecia is progressive. The earlier treatment begins, the more hair can be preserved. Treatment does not reverse established loss but can slow or halt progression.
3. Alopecia Areata
Alopecia areata is an autoimmune condition in which the immune system attacks hair follicles, causing patchy hair loss. It can affect the scalp, eyebrows, eyelashes, and body hair.
What it looks like: One or more smooth, well-defined circular patches of hair loss, typically without visible skin changes within the patch.
Important: Alopecia areata can be distressing, but most cases do recover. Extensive alopecia areata (alopecia totalis affecting the entire scalp, or alopecia universalis affecting the whole body) is less predictable. Early assessment by a dermatologist is recommended.
4. Scarring Alopecias
A group of conditions — including lichen planopilaris, discoid lupus erythematosus, and central centrifugal cicatricial alopecia — cause permanent hair loss by destroying follicles and replacing them with scar tissue. These are less common but require prompt diagnosis and treatment to halt progression, as lost follicles cannot be recovered.
Warning signs: Hair loss accompanied by persistent scalp redness, scaling, burning, or pain should be evaluated urgently.
When to See a Dermatologist for Hair Loss
See a dermatologist if:
- Hair loss is more than 100 hairs per day consistently (or noticeably more than your baseline)
- You can see visible thinning — a wider parting, a noticeable decrease in ponytail thickness, or visible scalp through the hair
- Hair loss is patchy — patches of complete or near-complete hair loss, especially smooth circular patches
- Scalp symptoms accompany hair loss — itching, burning, tenderness, redness, or scaling
- Hair loss is associated with other symptoms — fatigue, weight changes, temperature sensitivity (suggesting thyroid or autoimmune disease)
- Hair fall began 2–3 months after a significant illness, surgery, or stressful event and has not improved after 6 months
- You are a woman with progressive thinning at any age — hormonal and nutritional factors are often addressable
- Hair loss is affecting your quality of life — regardless of severity by clinical standards, psychological impact is a valid reason to seek care
Investigations a Dermatologist May Order
A thorough evaluation for hair loss typically includes:
- Blood tests: CBC, thyroid function (TSH), serum iron, ferritin, vitamin D, zinc
- In women: hormonal panel if indicated (DHEA-S, testosterone, prolactin)
- Scalp examination with dermoscopy (a specialised hand-held magnification device)
- Occasionally: scalp biopsy (for scarring alopecia or unclear diagnosis)
Treatments Available
Depending on the type and cause of hair loss:
- Nutritional deficiencies: Supplementation with medical guidance
- Androgenetic alopecia: Minoxidil (topical/oral), finasteride (men), spironolactone or certain contraceptives (women), hair transplant for established loss
- Alopecia areata: Topical, intralesional, or systemic corticosteroids; JAK inhibitors in severe cases
- Telogen effluvium: Address underlying cause; reassurance; nutritional support
- Scarring alopecias: Disease-specific immunomodulatory therapy to halt progression
No treatment reverses extensive established hair loss — which is why early assessment matters. If you are concerned about your hair, an evaluation now is better than waiting.
This article is for educational purposes only and not a substitute for medical advice. For an assessment of hair loss, call the clinic or visit a qualified dermatologist directly.