Febris was a chthonic healer invoked to avert or cure fevers, especially in marshy regions. In poetry, she appears in contexts of illness and recovery, reflecting Roman anxieties about disease and the thin line between divine punishment and mercy in matters of health.

Febris, along with her sisters Februa and Februus, formed a triad of fever deities worshipped to ward off malaria and other illnesses; temples to Febris existed on the Palatine and Esquiline hills; paradoxically, she was propitiated to keep fever away—naming the danger to control it; poets rarely invoke her directly, but she appears in medical or domestic charms; her worship reflects the Roman practice of deifying threats to gain power over them; she exemplifies the fine line between healing and disease in Roman religious thought.