A low blood count in men is most commonly caused by iron deficiency anemia from chronic occult bleeding. Other causes of iron deficiency anemia include intravascular hemolysis, vitamin C deficiency, as well as an increase in iron demand or decreased iron absorption, explains The Merck Manual Professional Edition.
Low blood count is a term used by doctors to describe anemia, explains eMedicineHealth. Anemia can develop in people whose diets lack certain vitamins, such as vitamin B-12. It can also occur as a result of poor nutrient absorption in Crohn’s disease and celiac disease, according to Mayo Clinic.
Menstruation is an important cause of anemia in premenopausal women because it can lead extensive blood loss. Pregnancy can cause iron deficiency anemia because of an increased iron demand by the baby. Chronic diseases, such as kidney failure, HIV and rheumatoid arthritis, can interfere with red blood cell production and decrease blood counts, explains Mayo Clinic.
Certain types anemia are inherited, including sickle-cell disease, thalassemia, congenital pernicious anemia, Fanconi anemia, hereditary spherocytosis and thrombotic thrombocytopenic purpura, explains Everyday Health.
Common symptoms of anemia include fatigue, decreased energy, weakness, shortness of breath, lightheadedness, heart palpitations and a pale skin color. Severe anemia can cause chest pain, dizziness, fainting, increased heart rate and heart attack, explains eMedicineHealth.