Hair Loss: Causes and Treatment Options

Understanding Hair Loss: A Common Concern

Hair loss affects millions of people worldwide and can significantly impact self-esteem and quality of life. Understanding the underlying causes helps guide appropriate treatment options, many of which are effective if started early.

Hair Loss Facts:

• 50% of men experience some hair loss by age 50
• 1 in 4 women experience hair loss
• Hair loss has multiple causes—identifying the cause is key to treatment
• Most causes are medically treatable
• Early intervention offers better outcomes

Normal Hair Growth and Shedding

Hair Growth Cycle

Anagen (Growth Phase)

• Active growth phase lasting 2-7 years
• Hair grows 0.5 inch per month
• 85% of scalp hair in this phase at any time

Catagen (Transition Phase)

• Brief transition lasting 2-3 weeks
• Hair stops growing
• 1% of scalp hair in this phase

Telogen (Resting Phase)

• Resting phase lasting 3-4 months
• Hair no longer attached to follicle
• 14% of scalp hair in this phase
• Shedding normally occurs (50-100 hairs daily normal)

Normal Hair Shedding

• Losing 50-100 hairs daily is normal
• Seasonal variation (more shedding in fall/spring)
• Short-term hair loss (telogen effluvium) common after stress or illness

Types of Hair Loss

Androgenetic Alopecia (Male/Female Pattern Hair Loss)

Male Pattern Baldness

• Most common type of hair loss
• Caused by genetic sensitivity to DHT (dihydrotestosterone)
• Progressive pattern: Receding hairline, crown thinning, vertex baldness
• Can begin as early as teens or 20s
• Family history significant risk factor

Female Pattern Hair Loss

• Similar genetic basis as male pattern baldness
• Different pattern: Diffuse thinning especially at crown and part line
• Usually maintains hairline
• Often worsens after menopause

Telogen Effluvium (Temporary Hair Loss)

• Increased shedding due to stressor pushing hairs into telogen phase
• Causes: Illness, surgery, high fever, stress, crash diets, medications
• Usually reversible within 3-6 months of removing stressor
• Generally self-limited

Alopecia Areata

• Autoimmune condition causing patchy hair loss
• Can progress to complete scalp loss (alopecia totalis) or body hair loss (alopecia universalis)
• More common in people with family history of autoimmune disease
• May recover spontaneously or require treatment

Trichotillomania (Hair-Pulling Disorder)

• Psychological condition causing repetitive hair pulling
• Results in patches of hair loss
• Often associated with stress, anxiety, or trauma
• Requires behavioral therapy and possibly psychiatric treatment

Other Types

Scarring Alopecia

• Permanent destruction of hair follicles
• Causes: Infection, inflammation, trauma, burns, tight pulling (traction alopecia)
• Difficult to treat once scarring occurs

Nutritional Deficiency Alopecia

• Iron deficiency anemia causes telogen effluvium
• Vitamin B12, zinc, protein deficiency also implicated
• Reversible with supplementation

Causes of Hair Loss: Investigation and Diagnosis

Medical Causes

Thyroid Disease

• Both hypothyroidism and hyperthyroidism cause hair loss
• Hair loss typically 2-3 months after thyroid dysfunction begins
• Reversible with thyroid treatment

Nutritional Deficiencies

• Iron deficiency (especially in women)
• Vitamin B12 deficiency
• Zinc deficiency
• Protein deficiency

Hormonal Changes

• Post-partum hair loss (telogen effluvium)
• Polycystic ovary syndrome (PCOS)
• Menopause (increased DHT sensitivity)
• Hormonal contraceptive changes

Systemic Diseases

• Lupus and other autoimmune conditions
• Syphilis
• Severe infections

Medications Causing Hair Loss

• Beta-blockers (heart medications)
• Anticoagulants (blood thinners)
• Chemotherapy
• High-dose vitamin A supplements
• Some contraceptives
• Some psychiatric medications

Lifestyle Factors

• Severe stress
• Crash dieting or severe calorie restriction
• Poor nutrition
• Tight hairstyles (traction alopecia)
• Excessive heat styling
• Chemical damage (dyes, bleach, relaxers)

Diagnosis: Medical Evaluation

History and Physical Examination

• Pattern of hair loss (gradual vs. sudden)
• Affected areas
• Associated symptoms
• Family history of hair loss
• Recent stressors or illnesses
• Medications and supplements

Laboratory Tests

If Concerning Features

• Complete blood count: Check for anemia
• Iron studies: Ferritin, TIBC, serum iron
• Thyroid function: TSH, free T4
• Vitamin B12 and folate: Check levels
• Zinc level: If suspected deficiency
• Hormonal panel: If PCOS suspected

Scalp Biopsy

• Sometimes needed to differentiate alopecia types
• Especially for scarring alopecia

Treatment Options for Hair Loss

Androgenetic Alopecia Treatment

Minoxidil (Rogaine)

• Available: Over-the-counter
• Mechanism: Stimulates hair growth and prolongs anagen phase
• Effectiveness: 40-50% see moderate to significant regrowth
• Dosing: Topical application twice daily
• Timeline: 6-12 months for visible results
• Note: Must continue for benefit to persist

Finasteride (Propecia)

• Available: Prescription only
• Mechanism: Blocks DHT conversion (male pattern baldness cause)
• Effectiveness: 65-90% maintain existing hair, some regrowth
• Dosing: 1mg daily oral tablet
• Timeline: 3-6 months for benefits
• Note: Men only (safety in pregnancy not established)
• Side effects: Rare but include sexual dysfunction

Combination Therapy

• Finasteride + minoxidil more effective than either alone
• Many men use both for optimal results

Other Options

• Hair transplant: Surgical treatment moving hair from dense areas
• Low-level laser therapy: Mixed evidence
• PRP injections: Platelet-rich plasma (emerging, needs more evidence)

Alopecia Areata Treatment

Corticosteroids

• Intralesional injections into bald patches
• Oral corticosteroids for extensive involvement
• Response variable; some spontaneous remission

Topical Immunotherapy

• Chemical sensitizer applied to patches
• May stimulate regrowth through immune mechanism

JAK Inhibitors (Newer)

• Ruxolitinib approved for alopecia areata
• Topical application to affected areas
• Promising results in clinical trials

Telogen Effluvium Treatment

• Identify and remove stressor (illness recovery, stress reduction)
• Usually resolves within 3-6 months spontaneously
• Address any nutritional deficiencies
• Patient reassurance often helpful (not permanent)

Nutritional Deficiency Treatment

• Iron supplementation for iron deficiency
• B12 supplementation or injections
• Zinc supplementation if deficient
• Hair regrowth expected within 3-6 months of correcting deficiency

Hair Health and Loss Prevention

Nutritional Support

Essential Nutrients for Hair Health

• Protein: Hair is primarily keratin protein
• Iron: Critical for hair growth
• Zinc: Necessary for hair structure
• Vitamin B12: Important for red blood cells carrying oxygen
• Selenium: Supports thyroid health
• Vitamin D: Regulates hair growth cycle

Balanced Diet for Hair Health

• Lean proteins (chicken, fish, eggs, legumes)
• Iron-rich foods (spinach, red meat, fortified cereals)
• Healthy fats (nuts, seeds, fatty fish)
• Fruits and vegetables (antioxidants)

Hair Care Practices

• Avoid tight hairstyles that pull on hair (traction alopecia risk)
• Use gentle shampoos and conditioners
• Minimize heat styling (use heat protectant if necessary)
• Avoid excessive chemical treatments
• Get regular trims to remove damaged hair
• Use silk pillowcases (reduce friction)

Stress Management

• Chronic stress triggers telogen effluvium
• Regular exercise improves stress resilience
• Meditation and mindfulness helpful
• Adequate sleep important for hair health

Key Takeaways: Hair Loss Action Plan

• Distinguish between normal shedding and pathological hair loss
• Seek medical evaluation for persistent or progressive hair loss
• Identify underlying cause—many are treatable
• For male/female pattern baldness, start treatment early for best results
• Minoxidil and finasteride are evidence-based, effective treatments
• Address nutritional deficiencies and medical causes
• Be patient—hair regrowth takes 3-6 months minimum
• Combine medical treatment with good hair care practices