[Infectious mastitis: a new solution for an old problem].

Mastitis is an inflammation of one or several mammal lobes accompanied or not by a mammary gland infection (WHO 2000). The most frequent etiology is infectious, and the highest prevalence period in women is breast-feeding time. The incidence varies from 2 to 33% according to different authors, being more frequent in primiparous women and during the early postpartum weeks. There are other breast inflammatory processes related etiologies, unrelated to breastfeeding, such as neoplasms or trauma to which no reference is made at this time, since the primary objective of this work is focused on infectious etiology which is caused almost exclusively in relation to postpartum and lactation factors.