If you have these lines on your nails after 40, it is a clear sign that
1.Ā Vertical Ridges (Longitudinal Lines)
š¢Ā Usually harmless
What it means: Common with aging. The nail matrix slows down, leading to ridges.
When to worry: If they becomeĀ deep, discolored, or are paired with brittleness, it could suggest:
Vitamin or mineral deficienciesĀ (iron, B12, magnesium)
Dehydration
Poor circulation
2.Ā Horizontal Ridges (Beauās Lines)
š“Ā More serious
What it means: These lines runĀ side to sideĀ and may indicate aĀ disruption in nail growth.
Possible causes:
Severe illness or infection (e.g., COVID-19, flu, pneumonia)
DiabetesĀ or poor blood sugar control
Thyroid disorders
Chemotherapy or major physical stress
Malnutrition or zinc deficiency
ā ļøĀ Beauās lines are aĀ clear sign your body went through a major stress or illnessĀ and temporarily stopped nail growth.
3.Ā Dark Lines Under the Nail (Melanonychia)
ā ļøĀ Could be a sign of skin cancer
What it means: AĀ dark vertical streakĀ under the nail, especially on one nail.
Possible cause:Ā Subungual melanomaĀ ā a rare but dangerous type of skin cancer.
More common in people over 40.
Also possible with trauma or certain medications, but if it grows or darkens, get it checked.
ā Ā If the line isĀ dark, uneven, or spreading,Ā see a dermatologist immediately.
4.Ā White Lines or Spots (Leukonychia)
Common causes: Minor trauma or zinc deficiency.
If persistent or widespread, may signal:
Liver disease
Low protein or albumin levels
5.Ā Red or Brown Streaks (Splinter Hemorrhages)
Tiny blood lines under the nails
Could indicate:
Heart infection (endocarditis)
Autoimmune disorders
High blood pressureĀ or trauma
ā Ā What You Should Do:
Monitor your nails like you would your skin or eyes ā they reflect internal health.
If you noticeĀ new, dark, deep, or spreading lines, donāt ignore them.
Consider checking for:
Vitamin deficiencies (B12, iron, zinc)
Thyroid function
Blood sugar (A1C)
Liver and kidney function