Causes
By Mayo Clinic staff
Normally low hemoglobin counts
A low hemoglobin count isn't always a sign of illness — it may be normal for some people. Women who are pregnant commonly experience low hemoglobin counts.
Low hemoglobin counts associated with diseases and conditions
A low hemoglobin count can be associated with many diseases and conditions that cause your body to have too few red blood cells. This can occur if your body produces fewer red blood cells than usual, if your body destroys red blood cells faster than they can be produced, or if you experience blood loss.
Diseases and conditions that cause your body to produce fewer red blood cells than normal include:
Aplastic anemia
Cancer
Certain medications, such as anti-retroviral drugs for HIV infection and chemotherapy drugs for cancer and other conditions
Cirrhosis
Hodgkin's lymphoma (Hodgkin's disease)
Hypothyroidism (underactive thyroid)
Iron deficiency anemia
Kidney disease
Lead poisoning
Leukemia
Multiple myeloma
Myelodysplastic syndromes
Non-Hodgkin's lymphoma
Vitamin deficiency anemia
Diseases and conditions that cause your body to destroy red blood cells faster than they can be made:
Enlarged spleen (splenomegaly)
Porphyria
Sickle cell anemia
Thalassemia
Vasculitis
A low hemoglobin count can also be due to blood loss, which can occur because of:
Bleeding from a wound
Bleeding in your digestive or urinary tract
Frequent blood donation
Heavy menstrual periods
Nosebleeds
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