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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 means that a person's hemoglobin level when measured, is below the lowest limits of normal for their age and sex (see above normal range of values). For example, a 19 year old male would have low hemoglobin if the detected blood value was below 13.6 g/dl.Another term frequently used in place of low hemoglobin is anemia, or the person is described as being anemic. Some of the more common causes of anemia are as follows:1  Nutritional (iron, folic acid, or vitamin B 12 deficiency [ pernicious anemia 2  ]). Gastrointestinal blood loss (ulcers, colon cancer). 3  Kidney problems.N THIS ARTICLE. 1  What is hemoglobin? 2  How is hemoglobin measured? 3  What are normal hemoglobin values? 4  What does low hemoglobin mean? 5  What does high hemoglobin mean? 6  What is anemia and what are its symptoms? 7  What is sickle cell disease? 8  What is thalassemia? 9  What is the hemoglobin A1c test? 10  Hemoglobin Levels Topic Guide.