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1 Large numbers of red blood cells may be caused by bleeding in the joint from injury, inflammation, or abnormal clotting of the blood. 2  Large numbers of white blood cells may be caused by gout, pseudogout, other types of arthritis (such as rheumatoid arthritis), psoriatic arthritis, injury, or infection.nfection, bleeding, or damage to the tendon, nerve, or joint is rare. Sometimes your doctor may not be able to draw any fluid out. The joint space may be too small, you may have scar tissue in the joint space, or there may not be any fluid in the joint. The joint may be sore for 1 to 2 days after the procedure.
When something is wrong with your blood, it can affect your total health. That is why it is important for you to know about some of the common blood disorders that may affect you. People may be affected by many different types of blood conditions and blood cancers. Common blood disorders include anemia, bleeding disorders such as hemophilia, blood clots, and blood cancers such as leukemia, lymphoma, and myeloma. Talking to your doctor is the first step to take if you believe you may have a blood condition. If you are diagnosed with a blood disorder, your doctor may refer you to a hematologist. What is Hematology? Hematology is the study of blood in health and disease. It includes problems with the red blood cells, white blood cells, platelets, blood vessels, bone marrow, lymph nodes, spleen, and the proteins involved in bleeding and clotting (hemostasis and thrombosis).