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Quick Answer. A low hemoglobin count, also known as anemia, is caused by pregnancy, a menstrual period, a diet low in iron, blood loss, or a disease that causes the body to produce fewer red blood cells or to destroy red blood cells. According to the Mayo Clinic, medications also sometimes cause anemia.
Low hemoglobin with low RBC count and low hematocrit indicates anemia. Some causes include: 1  Excessive loss of blood from, for example, severe trauma or chronic bleeding from sites such as the digestive tract (e.g., ulcers, polyps, colon cancer), the bladder or uterus (in women, heavy menstrual bleeding, for example).he hemoglobin test may be ordered during a general health examination or when a person has signs and symptoms of a condition affecting red blood cells such as anemia or polycythemia. Some signs and symptoms of anemia include: 1  Weakness or fatigue. 2  Lack of energy. 3  Fainting. 4  Paleness (pallor). 5  Shortness of breath.