Anemia in all its variations, lymphoma, leukemia and multiple myeloma are blood diseases, according to WebMD. Von Willebrand disease and myelodysplastic syndrome are also blood diseases.
Anemia occurs when people have a low number of red blood cells, and people who have kidney disease often develop anemia, explains WebMD. Lymphoma occurs when a white blood cell turns cancerous. In leukemia, a white blood cell becomes cancerous inside bone marrow. Myelodysplastic syndrome is blood cancer that sometimes turns into leukemia. Multiple myeloma causes organ damage.
The majority of people with Von Willebrand disease do not know they have it and are often not symptomatic, notes WebMD. Some bleed profusely after surgery; the disease causes the body to produce too little of the protein that clots blood or produce a defective protein.