Whether you prefer them full or trimmed back, sideburns can help to make a stylish statement, enhance facial symmetry and aesthetics, or create a more masculine appearance. Hair thinning or loss in this area can be frustrating for both men and women, and this concern can be caused by a wide range of conditions. Some of the most common sources of sideburn hair loss include trauma and facial scarring, genetic predisposition, cosmetic procedures (such as facelift surgery or laser hair removal), and removal of skin cancers. For women, wearing their hair back in tight braids, ponytails, or other styles can also lead to thinning and hair loss in this area.