Discover hair loss causes and evaluation methods used to determine suitability for hair transplant.

Understand the early signs of hair loss, such as thinning or receding, and learn about the key genetic and lifestyle risk factors for baldness.

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Understanding Hair Loss: Causes, Stages, and Evaluation

Hair loss is often dismissed as a simple cosmetic nuisance, a sign of aging, or “bad genes.” But medically, it is a complex condition driven by hormones, genetics, and environmental factors. Before we can design a new hairline, we must understand why the old one is receding.

At Liv Hospital, we approach hair transplantation not as a product to be sold, but as a medical treatment for a specific diagnosis. We do not simply count grafts; we evaluate the biology of your scalp. Is your hair loss stable? Is it caused by stress or a thyroid issue? Is your donor area strong enough to support a transplant for life? Our Causes and Evaluation protocol ensures that every patient we operate on is a suitable candidate for a lifelong result.

Androgenetic alopecia, commonly known as pattern baldness, is the most frequent cause of hair loss in both men and women. It is a genetic condition in which hair follicles are sensitive to dihydrotestosterone (DHT). This hormone causes the follicles to shrink over time, a process called miniaturization.

As the follicles shrink, the hair they produce becomes thinner, shorter, and more brittle. Eventually, the follicle stops producing hair altogether. In men, this typically follows a receding hairline and thinning at the crown.

The genetics of this condition can be inherited from either the mother’s or the father’s side of the family. It is a polygenic trait, meaning multiple genes are involved. Understanding this genetic predisposition is the first step in evaluation.

  • Genetic sensitivity to dihydrotestosterone
  • Progressive miniaturization of hair follicles
  • Patterned recession and thinning
  • Inheritance from maternal or paternal lines
  • Polygenic nature of the condition
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The Biology of Hair: Why Does It Fall?

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To understand hair loss, you must understand the hair growth cycle. Every hair on your head operates on its own clock, cycling through three phases:

  1. Anagen (Growth): Lasts 2–6 years. The hair grows about 1cm per month.
  2. Catagen (Transition): Lasts 2–3 weeks. The follicle shrinks and detaches from the blood supply.
  3. Telogen (Resting): Lasts 3–4 months. The old hair falls out (shedding), and the follicle rests before starting a new Anagen phase.

Normal Shedding vs. Hair Loss It is normal to lose 50–100 hairs a day. This is just the “Telogen” phase in action. Hair Loss (Alopecia) occurs when the new hair that replaces the old one is thinner, weaker, or doesn’t grow back at all.

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What is Androgenetic Alopecia?

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In 95% of men and many women, hair loss is caused by Androgenetic Alopecia (Male/Female Pattern Baldness). This is a genetic sensitivity to a hormone called DHT (Dihydrotestosterone).

How DHT Kills Hair

DHT is a byproduct of testosterone. In susceptible individuals (determined by genetics), DHT binds to receptors in the hair follicles—specifically on the top and front of the scalp.

  • Miniaturization: Over time, DHT causes the follicle to shrink. The “Anagen” (growth) phase gets shorter and shorter.
  • The Result: Thick, terminal hairs are replaced by thin, wispy “vellus” hairs (peach fuzz). 
  • The “Safe Zone”: The hair on the back and sides of the head (the donor area) is genetically immune to DHT. 

Other Common Causes

Not all hair loss is genetic. Before recommending surgery, we must rule out reversible causes.

  • Telogen Effluvium (Stress Shedding): A sudden, diffuse shedding caused by severe stress, surgery, rapid weight loss, or high fever (like COVID-19). This is usually temporary and does not require a transplant.
  • Nutritional Deficiencies: Lack of Iron (Anemia), Vitamin D, B12, or Zinc can starve hair follicles.
  • Alopecia Areata: An autoimmune disease where the body attacks hair patches, leaving smooth, round bald spots. Transplantation is not effective for this condition.
  • Traction Alopecia: Hair loss caused by tight hairstyles (braids, ponytails) pulling on the roots.

What is the Norwood Scale?

We use the Norwood-Hamilton Scale to classify the severity of hair loss in men. This helps us estimate the number of grafts needed.

  • Stage 1: No significant recession. (No surgery needed).
  • Stage 2: Mild recession at the temples (M-shape). (1,500–2,000 grafts).
  • Stage 3: Deep recession at temples; hairline has moved back. The first stage where transplantation is commonly recommended. (2,000–3,000 grafts).
  • Stage 4: Significant frontal loss + thinning at the crown (vertex). A “bridge” of hair separates the two. (3,000–4,000 grafts).
  • Stage 5: The bridge between front and crown begins to break down. (4,000+ grafts).
  • Stage 6–7: The bridge is gone. The front and crown have merged into one large bald area. Only a horseshoe pattern remains on the sides. (Evaluation critical: Donor area may not be sufficient for full coverage).

The Ludwig Scale

Women rarely go completely bald. Instead, they experience Diffuse Thinning over the top of the scalp. The hairline usually remains intact.

  • Type I: Mild thinning on the part line. Camouflage (hair fibers) or PRP is often better than surgery.
  • Type II: Moderate widening of the part and decreased volume. Transplant can increase density.
  • Type III: Significant see-through scalp on top. Requires careful evaluation of donor density.

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The Liv Hospital Evaluation Protocol

Many clinics ask for a few WhatsApp photos and give you a quote. At Liv Hospital, we dig deeper.

1. Computerized Trichoscopy

We use a digital dermatoscope to magnify the scalp 50x–200x.

  • Donor Density Check: We count exactly how many follicular units (FU) you have per square centimeter in the back of your head. Average is 70–80 FU/cm². If you have <50 FU/cm², you may not be a good candidate.
  • Miniaturization Mapping: We check if the donor hair itself is thinning. If >20% of your donor hair is miniaturized (DUPA – Diffuse Unpatterned Alopecia), a transplant will fail because the transplanted hair will eventually fall out too.

2. Blood Panel

We screen for “silent” health issues that kill hair grafts.

  • Thyroid Function (TSH/T3/T4): Hypothyroidism causes brittle, shedding hair.
  • Iron (Ferritin): Low iron is the #1 cause of hair loss in women.
  • Blood Sugar (HbA1c): Uncontrolled diabetes impairs wound healing and graft survival.

3. The “Safe Donor” Calculation

This is the most critical step. Your donor area is a finite resource. You typically have about 6,000–8,000 grafts available for lifetime extraction.

  • The Strategy: If you use 4,000 grafts at age 25 to fix a hairline, you have only 2,000 left for the rest of your life. If you go bald at the crown at age 35, you may not have enough hair left to fix it.
  • Conservative Planning: We plan for the future, not just today. We may recommend a higher hairline now to save grafts for later.

The Celebrity Influence

Public figures have played a significant role in destigmatizing hair restoration. The Elon Musk hair transplant story is frequently cited as a prime example of how successful restoration can change appearance and perception. Transformations of high-profile individuals demonstrate the potential of modern techniques.

This visibility encourages men to seek help earlier. It also sets a benchmark for what natural results should look like. However, patients need to understand that celebrity results often involve unlimited budgets and multiple procedures.

Evaluations now often include discussions about these public transformations. They serve as a reference point for setting realistic personal goals.

  • Destigmatization through public figures
  • Demonstration of transformative potential
  • Encouragement for early intervention
  • Setting benchmarks for natural results
  • Managing expectations versus celebrity budgets

Who is NOT a Candidate for Hair Transplant?

Honesty is our policy. We turn away about 15–20% of applicants because surgery would harm them. You might not be eligible if:

  • Insuffcient Donor Area: You don’t have enough hair in the back to cover the bald spot in the front. (Taking too much would leave the back of your head looking moth-eaten).
  • Unrealistic Expectations: You want a straight, dense “teenager” hairline at age 50.
  • Active Alopecia Areata: The disease will attack the new grafts too.
  • Keloid Scarring: If you are prone to thick, raised scars, surgery is risky.

Calculating Graft Requirements

Accurate graft calculation is a mathematical and artistic exercise. The surgeon measures the recipient site’s surface area in square centimeters. They then determine the target density, typically expressed as follicular units per square centimeter.

A typical dense look requires 40 to 60 grafts per square centimeter. The donor area’s safe capacity limits the total number. Overharvesting can lead to a moth-eaten appearance at the back of the head.

Software tools can assist in this calculation, but clinical judgment is paramount. The goal is to maximize visual impact with the available resources.

  • Measurement of the recipient surface area
  • Determination of target follicular density
  • Safe capacity limits of the donor zone
  • Prevention of donor area overharvesting
  • Balancing density with coverage area

Donor Area Evaluation

The quality of the donor area dictates the potential result. The surgeon examines the hair’s caliber (shaft thickness), the color contrast between hair and skin, and whether the hair is curly or straight.

Thicker hair provides more coverage with fewer grafts. Curly hair also covers the scalp better than straight hair. Low contrast (e.g., blonde hair on fair skin) creates an illusion of fullness more easily than high contrast.

Densitometry is used to count follicular units and hairs per unit. A donor area with many 3- and 4-hair units is ideal for achieving high density.

  • Assessment of hair shaft caliber
  • Impact of hair texture and curl
  • Role of color contrast with skin
  • Densitometry for precise follicle counting
  • Value of multiple hair follicular units

Scalp Analysis Technology

Modern clinics use digital trichoscopy to analyze the scalp. This high magnification imaging reveals signs of inflammation, miniaturization, and empty follicles that are invisible to the naked eye.

It helps distinguish between androgenetic alopecia and other types of hair loss, such as telogen effluvium. It can also assess scalp vascularity, a crucial factor for graft survival.

This data is stored to track the patient’s progress over time. It provides an objective baseline for measuring the success of the surgery and medical therapies.

  • High magnification digital trichoscopy
  • Detection of subclinical inflammation
  • Differentiation of hair loss types
  • Assessment of scalp vascularity
  • Objective baseline for progress tracking

FREQUENTLY ASKED QUESTIONS

Can hair be transplanted from other parts of the body?

Yes, beard and chest hair can be used as donor sources if the scalp donor area is insufficient, though they have different textures and growth cycles.

No, the follicles are physically moved from the donor area to the recipient area; they do not regenerate in the donor zone, which is why prudent harvesting is essential.

Shock loss is a temporary shedding of native hair due to the trauma of surgery; it is a normal reaction, and the hair typically grows back within a few months.

Yes, grey hair can be transplanted successfully; the process is the same, though the surgeon may temporarily dye the hair to make the white follicles more visible under the microscope.

There is no strict upper age limit as long as the patient is healthy; however, very young patients are often advised to wait until their hair loss pattern becomes more defined.

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