Anemia means lower-than-normal levels of red blood cells or hemoglobin, which can reduce the blood’s ability to carry oxygen. Severity ranges from mild, often unnoticed fatigue to forms that affect daily life. Below is general information on typical symptoms, common causes, diagnostic steps and specialist referrals.
Anemia develops when hemoglobin or the number of red blood cells falls below expected values. Common types include iron-deficiency anemia, vitamin B12 or folate deficiency anemias, anemia of chronic disease, hemolytic anemias and inherited hemoglobin disorders. Identifying the type helps determine the underlying cause and the next steps in evaluation.
Symptoms range from subtle to pronounced and depend on how quickly anemia develops and its severity. Frequently reported signs are tiredness, pale skin or lips, shortness of breath with exertion, palpitations, lightheadedness and difficulty concentrating. Some people have only mild or non-specific complaints.
Anemia can result from blood loss (for example heavy menstrual bleeding or gastrointestinal bleeding), dietary deficiencies (iron, B12, folate), chronic inflammatory or kidney disease, pregnancy, or inherited blood disorders. Risk factors include age, sex (people who menstruate), pregnancy, chronic illnesses and insufficient dietary intake.
Initial evaluation usually starts with a complete blood count (CBC). Depending on results, tests may include reticulocyte count, iron studies, B12 and folate levels, and tests to look for bleeding sources. Primary care (family medicine) or internal medicine is a common first step. Hematology may be involved for complex cases or when advanced testing and specialist management are required. Pediatrics and obstetrics/gynecology are often the appropriate starting points for children or pregnancy-related concerns. Symptoms such as severe shortness of breath, fainting or chest pain warrant urgent medical attention or an emergency department visit.
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