Spoon-shaped nails are thin, curved inward, and often appear brittle or concave — like the nail could hold a drop of water.

This condition is strongly linked to:

Iron-deficiency anemia

Hemochromatosis (iron overload)

Thyroid disorders

It’s especially common in children and women of childbearing age — where iron stores may fluctuate due to diet or menstruation.

✅ What to Do: Request a blood test for ferritin, iron, and hemoglobin if you notice spooning developing over time.

🌑 4. Black Streaks or Bands: Could Signal Melanoma

A dark streak running vertically under the nail — especially if it extends from the cuticle to the tip — may not just be a bruise.

Known as melanonychia , these bands can sometimes be caused by subungual melanoma , a rare but serious form of skin cancer.

Other causes include:

Trauma (like hitting your thumb)

Medication side effects

Ethnic pigmentation (common in darker-skinned individuals)

⚠️ Rule of Thumb: If the band appears suddenly, is wide, or affects only one nail — get it checked by a dermatologist.

🦴 5. Yellow Nails: May Indicate Fungal Infection or Lymphatic Issue

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