Concept

Pernicious anemia

Summary
Pernicious anemia is a disease in which not enough red blood cells are produced due to a deficiency of vitamin B12. Those affected often have a gradual onset. The most common initial symptoms are feeling tired and weak. Other symptoms of anemia may include shortness of breath, lightheadedness, headaches, sore red tongue, cold hands and feet, pale or yellow skin, chest pain, and an irregular heartbeat. The digestive tract may also be disturbed giving symptoms that can include nausea and vomiting, heartburn, upset stomach and loss of appetite. Symptoms of vitamin B12 deficiency may include decreased ability to think, numbness in the hands and feet, memory problems, blurred vision, trouble walking, poor balance, muscle weakness, decreased smell and taste, poor reflexes, clumsiness, depression, and confusion. Without treatment, some of these problems may become
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