Premature greying of hair in children: A comprehensive review for pediatricians and primary care physicians

 Corresponding author: Venugopal Reddy. I Copyright © 2025 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution License 4.0. Premature greying of hair in children: A comprehensive review for pediatricians and primary care physicians Venugopal Reddy. I * Department of Pediatrics, Ovum Woman and Child Speciality Hospital, Bangalore, India. World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 501-508 Publication history: Received 25 September 2025; revised on 17 November 2025; accepted on 19 November 2025 Article DOI: https://doi.org/10.30574/wjbphs.2025.24.2.1017 Abstract Premature greying of hair (canities) in children is an increasingly recognized concern among parents and pediatricians. Although often benign, early hair depigmentation may be a clinical marker of nutritional deficiencies, autoimmune disorders, genetic predisposition, endocrine abnormalities, or oxidative stress related damage. The absence of standardized pediatrics guidelines leads to misdiagnosis, unnecessary anxiety, and missed opportunities for early intervention. This review synthesizes current evidence on epidemiology, pathophysiology, risk factors, diagnostic approach, and management of premature greying in children. A structured evaluation and targeted treatment of reversible causes especially vitamin B12, iron, vitamin D, zinc deficiency, and hypothyroidism can halt or partially reverse greying in many children. This article provides an evidence-based, clinically practical approach suitable for pediatricians, dermatologists, and general practitioners. Keywords: Premature Canities; Pediatrics; Grey Hair in Children; Micronutrient Deficiency; Oxidative Stress; Thyroid Disorders; Trichology; Vitamin B12 Deficiency; Autoimmune Disorders 1. Introduction Hair greying is classically associated with ageing. When it appears in children, however, it becomes a source of anxiety and confusion for parents, and clinicians often lack clarity on appropriate evaluation. In recent years, an increase in reported cases of premature greying among Indian school-aged children has been observed, driven by nutritional transitions, lifestyle changes, stress, and rising autoimmune disorders. Despite being benign in most cases, early greying may serve as a clinical clue to underlying systemic disease. Early identification can facilitate timely intervention and prevent irreversible follicular melanocyte loss. 2. Definition Premature greying is defined based on ethnicity due to genetic differences in melanocyte ageing. Table 1 Age cut-off for Premature Greying based on Ethnicity Population Age cut-off for Premature Greying Caucasian <20 years Asian / Indian <25 years World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 501-508 502 African <30 years For pediatrics practice, greying occurring before 18 years warrants clinical evaluation. 3. Epidemiology Globally, premature greying affects 1–7% of children and adolescents, although true prevalence remains underestimated due to limited reporting. Recent trends indicate • Increasing cases in India, Middle East, South-East Asia • Higher prevalence in children with o Atopic diathesis o Vitamin B12 deficiency o Vegetarian diet patterns o Autoimmune thyroid disease o Family history of premature greying A school-based study from North India reported prevalence at 2.4%, with strong associations with micronutrient deficiencies. 4. Hair Pigmentation Physiology Hair color depends on the production and distribution of melanin by follicular melanocytes. Two pigments contribute to hair color. • Eumelanin – black/brown pigment • Pheomelanin – yellow/red pigment Melanocyte activity is active during the anagen (growth) phase and reduced during catagen and telogen. Greying occurs due to • Reduced melanocyte stem cells • Decreased tyrosinase activity • Accumulated free radical damage • Melanocyte apoptosis 5. Pathophysiology of Premature Greying 5.1. Oxidative Stress (Central Mechanism) • Recent research identifies oxidative stress as the key driver in premature greying. • Mechanisms include • Accumulation of hydrogen peroxide (H₂O₂) in the hair shaft • Reduced catalase and methionine sulfoxide reductase activity • Mitochondrial dysfunction • Melanocyte DNA damage Multiple studies show that children with premature greying exhibit elevated oxidative stress markers. 5.2. Nutritional Deficiencies Strongest evidence associations • Vitamin B12 deficiency World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 501-508 503 • Iron deficiency (low ferritin) • Vitamin D deficiency • Zinc deficiency • Copper deficiency (rare but significant) • Folate deficiency These nutrients are directly involved in • DNA synthesis • Methylation pathways • Antioxidant defense • Melanin production 5.3. Autoimmune Mechanisms Includes • Alopecia areata overlap • Vitiligo spectrum disorders • Thyroid autoimmunity (Hashimoto thyroiditis) Autoimmune activity may target melanocytes, leading to pigment loss. 5.4. Genetic Predisposition Familial premature greying is common. 5.4.1. Genes linked to early depigmentation • IRF4 – regulates melanin production • BCL2 – inhibits melanocyte apoptosis • MITF – melanocyte survival gene Children with a parent who developed greying before age 25 have a 4–7× higher risk. 5.5. Endocrine Causes Premature greying is linked with • Hypothyroidism • Hyperthyroidism • Type 1 Diabetes Thyroid hormones strongly influence hair follicle cycling and melanin expression. 5.6. Lifestyle and Environmental Factors • Air pollution and heavy metal exposure • Chronic stress and poor sleep • Ultra-processed foods • Overuse of chemical hair products, SLS shampoos, heat styling Children today face higher levels of oxidative burden due to modern lifestyle factors. 6. Clinical Presentation Common patterns include • Isolated grey strands • Patchy clusters World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 501-508 504 • Diffuse greying • Grey regrowth in alopecia areata patches • Associated scalp issues (seborrhea, dandruff, atopy) 7. Differential Diagnosis Table 2 Differential Diagnosis of Premature Greying in Children Condition Key Features Nutritional deficiencies Reversible, associated with poor diet Autoimmune disorders Vitiligo, alopecia areata Thyroid disorders Altered growth, fatigue, weight issues Genetic premature canities Strong family history Post-inflammatory greying Following dermatitis or trauma Systemic diseases Progeroid syndromes, mitochondrial disorders Drug-induced Chemotherapy, valproate, antimalarials 8. Diagnostic Evaluation 8.1. History • Age of onset • Progression speed • Family history • Vegetarian/vegan diet • Fatigue, weight issues (thyroid) • Autoimmune disease history • Stress, sleep hygiene • Hair care practices 8.2. Physical Examination • Pattern and distribution of grey hair • Scalp Dermoscopy • Skin examination for vitiligo • Nails (pitting suggestive of alopecia areata) • Growth charting • Pubertal staging 8.3. Recommended Investigations Table 3 Recommended Laboratory Tests and Purpose Investigation Purpose CBC Anaemia Ferritin, Iron, TIBC Iron deficiency Vitamin B12 Strong association with greying Folate Nutritional evaluation Vitamin D Hair follicle health Serum Zinc Oxidative balance Serum Copper Melanin synthesis TSH, Free T4 Thyroid disorders World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 501-508 505 Anti-TPO Autoimmune thyroiditis ANA Autoimmune screening Dermoscopy Follicular melanin evaluation 9. Management 9.1. Treat Reversible Causes 9.1.1. Nutritional Deficiencies Table 4 Treatment of Nutritional Deficiencies Deficiency Treatment Vitamin B12 IM/Oral B12 1000 mcg weekly × 4 weeks Iron 3–6 mg/kg/day elemental iron Vitamin D 60,000 IU weekly × 6 weeks Zinc 0.5–1 mg/kg/day Copper Only if confirmed; avoid unnecessary supplementation 9.2. Antioxidant Therapy 9.2.1. Helpful agents • Vitamin C • Vitamin E • Omega-3 fatty acids • Calcium pantothenate • PABA (limited evidence) 9.2.2. Natural antioxidants • Amla • Curry leaves • Black sesame seeds • Almonds, walnuts 9.2.3. Topical Therapies • Melitane™ peptide – stimulates melanogenesis • Topical minoxidil – if associated with hair thinning (not pigment regeneration) • Avoid: sulphates, parabens, artificial dyes 9.3. Lifestyle Modification • Reduce junk food • Increase antioxidants and proteins • Adequate sleep • Stress management • Avoid heat styling • Use mild shampoos 10. Prognosis • Nutritional causes: high reversibility within 3–6 months • Genetic causes: low reversibility World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 501-508 506 • Autoimmune causes: variable outcomes • Early diagnosis improves results significantly 11. Prevention • Balanced diet with adequate micronutrients • Screening for vitamin B12 and vitamin D in high-risk children • Healthy sleep routine • Avoid early chemical exposure to hair 12. Clinical Algorithm for Paediatricians Child with grey hair ↓ Detailed history + scalp examination ↓ Screen for red flags: (rapid progression, alopecia, vitiligo, family autoimmune disease) ↓ Order labs: (CBC, Ferritin, B12, Folate, Vitamin D, Zn, Cu, TSH, Dermo copy) ↓ Treat deficiencies or underlying disease ↓ Start antioxidant + dietary modification ↓ Review after 3 months ↓ If no improvement: Dermatology referral Table 5 Causes of Premature Greying in Children Category Examples Nutritional B12, Iron, Vitamin D, Zinc, Copper deficiency Autoimmune Alopecia areata, Vitiligo, Thyroiditis Endocrine Hypothyroidism Genetic IRF4, BCL2, MITF mutations Environmental Pollution, stress, food habits World Journal of Biology Pharmacy and Health Sciences, 2025, 24(02), 501-508 507 Drug-induced Chemotherapy, valproate Table 6 Investigation–Based Approach Laboratory Test Interpretation Action Low ferritin Iron deficiency Iron therapy Low B12 Megaloblastic risk B12 supplementation Low Vitamin D Follicle health Vit D therapy Low Zinc Oxidative stress Zinc supplementation High TSH Hypothyroid Levothyroxine Positive ANA Autoimmune Dermatology/Rheumatology referral 13. Discussion Premature greying in children requires a balanced approach that avoids over-investigation yet ensures identification of reversible causes. Micronutrient deficiencies, particularly vitamin B12, iron, zinc, and vitamin D, are prevalent in Indian children due to vegetarian dietary patterns and limited sun exposure. Autoimmune thyroid disease and alopecia areata are important considerations in children with rapid progression of greying or associated hair loss. Current evidence highlights the central role of oxidative stress in premature canities. This underscores the importance of antioxidant-rich diets, minimizing environmental exposures, and early correction of micronutrient deficiencies. Longterm studies are needed to clarify the extent of reversibility of pediatrics greying and evaluate newer topical depigmentation agents. 14. Conclusion Premature greying in children is a clinically relevant condition with significant parental concern. Early greying may be the first visible sign of underlying nutritional or autoimmune disease. A structured approach involving history, targeted investigations, nutritional correction, antioxidants, and lifestyle modifications forms the foundation of management. Most nutritional causes are reversible, especially when addressed early. Pediatricians should adopt an evidence-based evaluation strategy to optimize outcomes. Compliance with ethical standards Acknowledgments The author thanks colleagues and researchers for their invaluable insights into this pressing issue. Special thanks to the team at Ovum Woman and Child Specialty Hospital for their support. Disclosure of conflict of interest The author declares no conflict of interest. References [1] Trüeb RM. Oxidative stress in ageing of hair. Int J Trichology. 2009;1(1):6–14. [2] Daulatabad D, Singal A, Grover C. Vitamin B12 deficiency and premature canities: An under-recognised association. Indian J Dermatol. 2016;61(1):102–105. 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