Many of the symptoms of mastitis may resemble those associated with a plugged duct except that most of those symptoms are much more severe or pronounced with mastitis. Although most cases of mastitis start out as a clogged milk duct,this is not always the case, and in fact may have begun with any break in the skin directly leading to the breast infection. Symptoms include a hardened lump or entire section of the breast that is tender, swollen, or hot to the touch. This very painful area may even have some red streaking that begins at the site of infection and radiates outward and spreads across the breast. Many moms mistake mastitis for some other cause such as a flu because they don't realize that abreast infection can cause symptoms throughout the body. Flu-like symptoms such as body and backaches, extreme fatigue, and even severe headaches may be present when mastitis occurs. Although a low-grade fever can occur with plugged ducts, the classic symptoms of chills and fever above 101.3 indicate mastitis. Some moms try to treat their breast infection for 12 to 24 hours,however, if there is no resolution, immediate treatment from a knowledgeable healthcare professional is essential.