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www.reference.com/science/causes-red-blood-cells-small-size-38a469ff4fc45823

Microcytic anemia is the condition wherein red blood cells are smaller than normal, and it is primarily caused by iron deficiency anemia and thalassemia, according to Dr. Siamak T. Nabili writing for eMedicineHealth. Iron deficiency anemia occurs due to limited or inadequate iron intake.

www.reference.com/science/red-blood-cells-76cc71f6ea4d6f67

Red blood cells carry oxygen and nutrients to the tissues in the body and take away carbon dioxide. They are also called erythrocytes. They get their red color from a pigment called hemoglobin, and it is the hemoglobin that actually carries the oxygen and carbon dioxide.

www.reference.com/world-view/happens-many-red-blood-cells-891c9a08c6bfe4aa

Health Hype states that an excess amount of red blood cells affects the viscosity of blood and causes the rate of blood flow to decrease. While the body copes with a slight increase or decrease in the red blood cell concentration within the blood, too many red blood cells or too few red blood cells

www.reference.com/article/signs-small-red-blood-cells-disease-f35d3eb6f7296cce

Some signs of small red blood cells disease are a very enlarged spleen and other organs and jaundice, according to MedlinePlus and Healthline. One type of small red blood cells disease is thalassemia. There are basically two types: alpha and beta.

www.reference.com/article/long-red-blood-cells-live-f32452136131161a

A normal red blood cell lives for about 120 days. It takes about two days for the body to manufacture each red blood cell, and about two million are turned out every second. Production of new red blood cells occurs in the bone marrow.

www.reference.com/science/red-blood-cells-specialized-82bbe77037c57d32

According to Springfield Technical Community College, the primary role red blood cells play in the body is to transport oxygen from the lungs to the various body tissues. To carry out this task, the cells are filled with a substance called hemoglobin. Hemoglobin is so important to red blood cells th

www.reference.com/article/large-red-blood-cells-symptom-cancer-fa5d81e07c36fdfc

Large red blood cells, called macrocytosis, are not a cancer symptom but may signal a problem that needs to be examined medically, explains Mayo Clinic. Macrocytosis is not a disease and does not produce symptoms or signs. Vitamin B-12 or folate deficiencies, liver disease, hypothyroidism and alcoho

www.reference.com/article/causes-high-red-blood-cell-count-6720c67fa5e3ffa1

Genetic mutations, both inherited and acquired, are one primary cause of high red blood cell counts, also known as polycythemia, says MedicineNet. Sleep apnea and tumors are secondary causes of polycythemia.

www.reference.com/world-view/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.reference.com/article/red-blood-cell-count-tell-e25317bafc25535

A red blood cell count indicates how many red blood cells a person has, according to MedlinePlus. Doctors use it to diagnose conditions such as anemia, as well as other medical conditions. A normal range of red blood cells for women is 4.2 to 5.4 million cells per microliter, while a normal range fo