Blood cancer is a type of cancer or tumor. Blood cancer hurts the blood, bone marrow, lymph, and lymphatic system. Sometimes more than one body part is hurt.
The cause is usually different from other types of cancer. The way to find out if a person has this cancer is also different.
People with blood cancers see a kind of doctor called a hematologist (blood doctor) or oncologist (cancer doctor). There are other blood problems that are not blood cancers. A blood doctor also helps people with those problems.