6. Clubbing (Enlarged fingertips, curved nails)
Nails curve downward, tips puff up
Can indicate low oxygen levels — associated with:
Lung disease (COPD, cystic fibrosis)
Heart disease
Digestive disorders (Crohn’s, celiac)
Always evaluate with a healthcare provider.
7. Beau’s Lines (Horizontal Dents Across the Nail)
Deep grooves running side to side
Appear after illness, injury, or stress — such as:
High fever (e.g., pneumonia, COVID-19)
Chemotherapy
Severe malnutrition
Surgery
Each dent marks a point in time when nail growth paused.
8. Dark Lines Under the Nail
Thin brown/black lines (longitudinal melanonychia)
Can be:
Benign (common in people with darker skin tones)
Trauma-related
Medication side effect (e.g., chemotherapy)
Melanoma (rare but serious) — especially if only one nail, widening, or extends to the cuticle
Rule out cancer with a dermatologist — never ignore new dark streaks.
️ Nutrients That Support Healthy Nails
Biotin (Vitamin B7)
Supports keratin production — may improve thickness in deficient individuals
Iron
Prevents brittleness and spooning — crucial for oxygen transport
Zinc
Aids cell growth and repair — deficiency linked to white spots and slow growth
Protein
Nails are made of keratin — low intake weakens structure
Omega-3 Fatty Acids
Reduce inflammation and support scalp/nail hydration
