There are many different blood diseases that are diagnosed and treated by hematologists. Some of these are benign (non-cancerous) and others are types of blood cancer. They can involve one or more of the three main types of blood cells (red blood cells, white blood cells, and platelets). They can also involve blood proteins involved in clotting. Not every blood disorder requires treatment. This is a list of some of the more common blood disorders treated by community hematologists.

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