Nail biting, or onychophagia, carries significant health risks beyond appearance. This habit can injure gums, spread harmful ...

Medically reviewed by Susan Bard, MD Melanonychia, a black line on your nail, can be a sign of melanoma or benign ...

Studies estimate that up to 20 or 30 percent of preschoolers and school-aged children engage in habits such as thumb sucking or nail biting. Often dismissed as simple quirks of childhood, these ...