Oncology / hematology focuses on the diagnosis and treatment of blood disorders and cancerous diseases. Although hematology (blood) and oncology (cancer) are two separate medical sub-specialties of internal medicine, the two areas often overlap due to the fact that many cancers affect the blood, and vice versa.

Due to the complexity of these types of disorders, oncologists / hematologists are often consulted by other physicians and specialists.

By completing training in both areas of medicine, oncologists / hematologists are uniquely situated to provide care for both blood-related disorders and malignant diseases (cancers), as well as the types of cancer that affect the blood. These include lymphoma, myeloma and leukemia, among others. When providing care for these and other diseases, oncologists / hematologists often serve as part of a multidisciplinary medical team.