Low hemoglobin: Anemia may be caused by blood loss perhaps through GI bleeding or decreased blood production in bone marrow. Fatigue and shortness of breath are most common dymptoms.
Answered 3/6/2016
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Varied...: Causes are many (either production or destruction problem): iron deficiency (diet related), inherited conditions (sickle cell), auto-immune (hemolysis). Symptoms can include: easy fatigue and loss of energy, rapid heart beat (particularly with exercise), shortness of breath, headache, difficulty concentrating, dizziness, pale skin, leg cramps, and insomnia.
Answered 7/12/2018
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