Part 6: When to Seek Medical Evaluation for Nail Changes

While ordinary vertical ridges are completely normal, specific symptoms should be checked by a dermatologist or healthcare provider:

• Horizontal Grooves (Beau’s Lines): Deep indentations running across the nail plate from side to side.
• Dark Vertical Pigment Bands: Dark brown, black, or red lines underneath the nail bed that change in size or shape.
• Nail Splitting or Thickening: Severe brittleness causing the nail to split deeply or detach from the underlying nail bed (onycholysis).
• Color Changes: Sudden yellowing, whitening, or bluish discoloration across multiple nails.

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