Description
A decrease in red blood cells that happens when the body can't absorb enough vitamin B-12.
Overview
Pernicious anemia is a decrease in red blood cells that happens because the body can't absorb enough vitamin B-12. Common causes include a weakened stomach lining or an autoimmune condition.
Symptoms
Symptoms of pernicious anemia include fatigue and weakness. Untreated, the condition can cause heart and nerve damage.
Treatments
Treatment for pernicious anemia involves vitamin B-12 shots or pills.
Last Updated: December 26th, 2025
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