A brownish tint or dark streaks may occur naturally in people with darker skin tones. However, sudden or irregular brown discoloration should be evaluated, as it could indicate:
Thyroid disorders
Nutritional deficiencies
Rarely, melanoma affecting the nail bed
4. Red Nails
Reddish nails can sometimes reflect cardiovascular strain, potentially linked to:
High blood pressure
Heart disease
Circulatory problems
Red streaks under the nails may result from trauma but could also indicate endocarditis, an infection of the heart’s inner lining. Persistent redness warrants medical evaluation.
5. Purple or Bluish Nails
A bluish or purple hue often signals poor oxygen circulation, a condition known as cyanosis. Causes may include:
Lung disease
Heart disease
Circulatory issues
Temporary discoloration can occur in cold weather, but persistent changes should be addressed promptly.
