The cause: Vink puts them down to a lack of folic acid or vitamins B and C, while Wang blames trauma to the cuticles, such as picking, biting or pushing them back.
The fix: Trim away the hangnail and then leave your cuticles alone. Also try increasing the fruit and vegetable content in your diet.
5. Yellowish nails
The cause: Smoking or using nail polish without a base coat are common offenders. If neither applies to you, see a doctor-rarely, yellow nails can indicate liver problems.
The fix: Buffing can help, but Wang says the only way to truly get rid of yellow nails is to wait until the stained areas grow out.