The Spanish word 'mamitis' comes from New Latin 'mammitis', which was formed by combining two Latin elements: 'mamma' meaning 'breast' and the suffix '-itis' meaning 'inflammation'. This follows a common pattern in medical terminology where '-itis' is added to an anatomical term to indicate inflammation of that body part. The Spanish term simplified the double 'm' to a single 'm' while maintaining the same medical meaning of inflammation of the mammary glands (mastitis).

Some related simpler Spanish words include 'mama' (mom, breast), 'mamá' (mom), and 'mamar' (to breastfeed). All these words share the Latin root 'mamma' referring to 'breast' or 'mother', making it easier to remember that 'mamitis' refers to a condition affecting the mammary glands.

English speakers can recognize this word through several related terms: 'mammary' (relating to breasts), 'mammal' (animals that nurse their young), and especially medical terms ending in '-itis' like 'bronchitis', 'arthritis', and 'tonsillitis'. The pattern of adding '-itis' to indicate inflammation is identical in both languages. Additionally, the informal English term 'mommy' shares the same ancient root referring to 'mother/breast'.