According to the Mayo Clinic, enlarged red blood cells, or macrocytosis, is a non-specific medical condition that has a number of different causes. Among the most common are vitamin B12 deficiency, folate deficiency, alc... More »

A high red blood cell count, or polycythemia, may lead to easy bruising or bleeding, the formation of blood clots, pain in joints or bones, dizziness, fatigue and abdominal pain, states eMedicineHealth. In cases where an... More »

A low red blood cell count, most often referred to as anemia, can cause weakness, fatigue, dizziness, fainting, lack of energy, pale skin, rapid heart rate or palpitations and shortness of breath. Chronic anemia in child... More »

Causes of enlarged red blood cells, or macrocytosis, include folate deficiency, vitamin B-12 deficiency, liver disease, alcoholism and medication side effects, according to Mayo Clinic. Hematologists usually detect macro... More »

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 sign... More »

Inactivity due to a medical condition such as paralysis is one medical cause of blood clots in the legs, according to WebMD. Cancer can also cause blood clots in the legs, as can damage to blood vessels that occurs as a ... More »

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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. Iro... More »