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The two types of bone marrow are red and yellow, according to Medscape. Yellow marrow contains a preponderance of fat, while red marrow contains less fatty tissue and aids in the creation and development of red blood cells.


The main function of bone marrow is to produce blood cells. Human bone marrow can produce hundreds of billions of new cells every day. Other functions of bone marrow include storing fat and helping to remove old blood cells from circulation.


The most important signs of bone marrow diseases, such as multiple myeloma, are referred to as CRAB: excessive calcium in the blood, renal damage, and anemia or bone damage, according to Leukaemia and Lymphoma Research. Severe, persistent back pain is the most common symptom among patients diagnosed


Leukemia and aplastic anemia are both diseases that originate within the bone marrow, states MedlinePlus. Other cancers, such as lymphoma, may also spread into the bone marrow as they progress.


Bone marrow tests determine whether a person's bone marrow is healthy or not, according to the National Institutes of Health. Bone marrow tests may also determine if bone marrow is producing adequate amounts of blood cells. It is performed by removing small amounts of fluid or tissue from the marrow


MoreMarrowDonors.org is a U.S. organization dedicated to providing small amounts of compensation to bone marrow donors. Its mission is to promote marrow donations to increase the number of lives saved by blood marrow transplants.


As of 2014, the causes of bone cancer are not clearly defined, according to the National Cancer Institute. However, several risk factors have been identified, including having a family history of bone defects.


Some of the common symptoms that bone marrow cancers cause are bone pain, weakness or fatigue, weight loss, and fever. While these symptoms occur with multiple myeloma and leukemia, patients may experience other symptoms as well, according to Johns Hopkins Medicine.


Excessive thirst, nausea, weakness in the legs, and bone pain in the spine are all possible indicators of bone marrow cancer, or multiple myeloma. Other signs include weight loss, confusion and recurring infections, according to Mayo Clinic. Some people may not show symptoms immediately.


As explained by About.com, red bone marrow’s primary job is to produce blood cells. Red bone marrow produces two types of stem cells. Myeloid stem cells develop into red blood cells, platelets or myeloblast cells, which in turn develop into a type of white blood cell called a granulocyte. Lymphoid s