The main hazards of breast massagers come from improper operation and overuse, specifically the following hazards. First, the use of lubricants is not enough, the friction is too frequent or the skin is too sensitive, resulting in redness and swelling of the skin on the surface of the breast or even broken, inflamed and infected. Secondly, the massage amplitude is too large, the frequency is too fast, repeated activities to damage the mammary gland tissue, acute mastitis or even purulent infection. Third, appropriate use has a certain effect of breast augmentation, excessive use of local consumption of too much fat, causing breast laxity, sagging, seriously affecting the aesthetic. Fourth, during lactation, due to milk stagnation, the massager is a single method, it is difficult to achieve the purpose of breast dredging like manipulative massage, and even delay the condition. Fifth, breast hyperplasia is more serious or has formed breast nodules, the use of massager to a certain degree of stimulation of the breast, there is a risk of aggravating hyperplasia or stimulate the nodules to increase in size. Sixth, breast cancer and other serious breast diseases should be prohibited the use of breast massager, the use of which may exist to stimulate the risk of cancer cells.