What is a common cause of hangnails?

The correct option is based on the understanding that hangnails often arise due to the condition of the cuticles. When the skin around the nails becomes dry or brittle—often exacerbated by excessive hand washing or environmental factors—this can lead to the formation of hangnails. These small, torn pieces of cuticle can occur easily when the skin loses its moisture and elasticity.

Excessive filing of the nails or using a low-quality nail buffer primarily affects the nail plate and may lead to weakness or damage in the nails themselves, but they are less likely to directly cause hangnails. Applying too much nail polish can also contribute to nail health issues, but it does not have a direct connection to the formation of hangnails, which are specifically related to the condition of the cuticles. Thus, the common cause of hangnails is indeed linked to dry and brittle cuticles or frequent hand washing that strips moisture away.