Can signal past illness or stress that temporarily interrupted nail growth.

May appear after severe infection, high fever, or physical trauma.

Persistent lines should be evaluated by a healthcare professional.

3. Dark or Discolored Stripes

Brown or black streaks could sometimes indicate melanoma, a form of skin cancer.

Other causes may include medications, fungal infections, or repeated injury.

Any sudden or unusual stripe should be checked promptly.

4. Nutrient Deficiency Indicators