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www.mayoclinic.org/symptoms/high-red-blood-cell-count/basics/causes/sym-20050858

High red blood cell count may be caused by low oxygen levels, kidney disease or other problems. Low oxygen levels. Your body may increase red blood cell production to compensate for any condition that results in low oxygen levels, including: Heart disease (such as congenital heart disease in adults) Heart failure

www.healthline.com/health/blood-cell-disorders

Blood cell disorders impair the formation and function of red blood cells, white blood cells, or platelets. ... Red Blood Cell Count (RBC) Medically reviewed by Deborah Weatherspoon, PhD, RN, CRNA .

www.medicinenet.com/polycythemia_high_red_blood_cell_count/article.htm

Polycythemia (high red blood cell count) is a condition in which the body's red blood cells are elevated. Symptoms include fatigue, headache, itching, abdominal pain, joint pain. Learn about polycythemia causes, treatment, life expectancy, types and more.

my.clevelandclinic.org/health/symptoms/17810-high-red-blood-cell-count/...

A high red blood cell count may be a symptom of a disease or disorder, although it doesn’t always indicate a health problem. Health or lifestyle factors can cause a high red blood cell count. Medical conditions that can cause an increase in red blood cells include:

www.wisegeek.com/what-does-a-high-red-blood-cell-count-indicate.htm

Congenital heart disease is a heart defect or condition that has been present since birth. There are many different types of congenital heart problems a person may have, but many of them are accompanied by an elevated red blood cell count, shortness of breath, and difficulty with performing physical exercise. A high red blood cell count may ...

www.steadyhealth.com/articles/polycythemia-when-high-red-blood-cell-count...

Excess red blood cells and high hemoglobin levels may make the complexion unusually ruddy (red) . But the diseases can also interfere with circulation so much that people become ghostly pale [ 8 ]. People who have polycythemia vera typically have a lower quality of life even than people who develop leukemia or lymphoma.

www.reference.com/health/symptoms-high-red-blood-cell-count-16ef92fe1e539b2c

Typical symptoms of a high red blood cell count include fatigue and weakness, joint pain, itching and headaches, according to MedicineNet. In cases where this condition is accompanied by risk factors such as cancer of the kidney or liver, fullness and weight loss are common, says WebMD.

www.ehealthyblog.com/blood-disorders/5-commonly-found-diseases-of-red-blood-cells.html

Thalassemia is a common red blood cell disorder and it has been diagnosed when red blood cells do not develop properly in human bodies. Fragile red blood cell is the symptom of this disease. 5. Malaria. Malaria is basically an infection of red blood cells due to the activity of mosquito infected parasite.

labtestsonline.org/tests/red-blood-cell-count-rbc

A red blood cell (RBC) count is typically ordered as part of a complete blood count (CBC) and may be used as part of a health checkup to screen for a variety of conditions. This test may also be used to help diagnose and/or monitor a number of diseases that affect the production or lifespan of red blood cells.

www.newhealthadvisor.com/High-Red-Blood-Cell-Count.html

The terms polycythaemia and erythrocytosis are used by doctors if you have a high red blood cell count. Polycythaemia is an abnormally high concentration of hemoglobin in the blood through an increase in red cell numbers, whereas erythrocytosis only refers to a documented increase of red cell mass.