Check the other breast. Some lumpiness is normal. However, if the lump is new or unusual, it warrants examination by a physician. A lump found during a breast self-exam, a clinical breast exam or a mammogram does not necessarily mean that a woman has breast cancer. Nearly 80 percent of all breast lumps are noncancerous (benign). However, cancer is a possibility. Early detection and treatment provides the best outcome, so a woman shouldn’t let fear stop her from seeing a physician.