✅ 1. Vertical Ridges (Beau’s Lines – Mild Form)
What It Looks Like:
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Thin vertical lines from base to tip
Feels bumpy when you run a finger over it
Likely Cause:
Normal aging process — like wrinkles for nails
Slower cell turnover in the nail matrix
📌 Common in older adults, especially on fingernails.
✅ Usually harmless. 💡 Moisturizing cuticles may reduce appearance.
⚠️ If sudden, deep, or accompanied by discoloration — consider further evaluation.
⚠️ 2. Horizontal Depressions (True Beau’s Lines)
What It Looks Like:
Deep grooves or indentations across the nail
One or multiple lines on several nails
Possible Causes:
These indicate a temporary disruption in nail growth, such as:
Trigger
Explanation
✅ Severe illness (e.g., pneumonia, heart attack)
Growth paused during stress
✅ High fever or infection
Body redirects energy away from non-essentials
✅ Chemotherapy
Common side effect
✅ Zinc deficiency or malnutrition
Impacts protein synthesis
🔍 As the nail grows out, the line moves forward — acting like a timeline of past stress.
🩺 Not dangerous itself — but can reveal undiagnosed events.
⚠️ 3. Mee’s Lines (White Horizontal Bands)
What It Looks Like:
Multiple white lines across the nail bed
Parallel, flat bands (not raised)
Possible Causes:
Condition
Link
✅ Arsenic poisoning
Classic sign — now rare
✅ Kidney failure
Due to toxin buildup
✅ Liver disease
Especially chronic forms
✅ Chemotherapy
Temporary side effect
🩺 Always investigate if unexplained.
❗ 4. Muehrcke’s Lines (False Leukonychia)
What It Looks Like:
Paired white lines in the nail bed (don’t move as nail grows)
Blanche when pressure is applied
Associated With:
Low albumin levels (a protein in blood)
Often seen in liver or kidney disease
Can occur after chemotherapy
🩺 Requires medical testing — not a surface issue.
🚨 5. Melanonychia — Dark Brown or Black Streaks
This one needs special attention.
