Hematologic diseases and diseases of the lymphatic system viewed collectively. Hemic diseases include disorders involving the formed elements (e.g., erythrocyte aggregation, intravascular) and chemical components (e.g. blood protein disorders). Lymphatic diseases include disorders relating to lymph, lymph nodes, and lymphocytes. (Description adapted from: https://www.ncbi.nlm.nih.gov/mesh/68006425)