TOA can refer to different things depending on the context. In the medical field, TOA stands for tubo-ovarian abscess, which is a complication of pelvic inflammatory disease and can be life-threatening if the abscess ruptures and results in sepsis. Symptoms of TOA include fever, an elevated white blood cell count, lower abdominal-pelvic pain, and/or vaginal discharge. In other contexts, TOA can refer to a tall tree of the genus Casuarina, especially in northern Australia and the Pacific islands. Additionally, TOA can be an acronym for various phrases, such as "Total Operating Assets" in accounting.