An important factor in acute mastitis is the accumulation of milk during breastfeeding, which leads to mastitis. Applying heat can be somewhat effective, as it helps to unblock the milk, thus further alleviating and controlling the symptoms of mastitis. However, heat application is mainly used in the initial stage of mastitis. If the condition progresses further, with more apparent systemic symptoms or pus formation, then heat application is not very effective. Further anti-infection treatment and, if necessary, incision and drainage surgery are needed to control the condition.