This is a clinical practice guideline on the diagnosis, staging, treatment, supportive interventions and follow-up care for adult patients with lymphoma. Staging techniques include immunohistochemical and fluorescence in situ hybridization (FISH) testing. Treatment and management options are discussed for Hodgkin and non-Hodgkin lymphomas, with recommendations based on cancer type and stage. Outcomes of interest include response rates, disease progression, survival, remission, and adverse effects.