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  1. Anemia - Symptoms and causes - Mayo Clinic

    May 11, 2023 · Anemia is a problem of not having enough healthy red blood cells or hemoglobin to carry oxygen to the body's tissues. Hemoglobin is a protein found in red cells that carries oxygen from the …

  2. Anemia: Symptoms, Causes & Treatment - Cleveland Clinic

    What is anemia? Anemia is a blood disorder that happens when you don’t have enough red blood cells or your red blood cells don’t work as they should. Some types of anemia are inherited, but people …

  3. Anemia: Causes, Symptoms, Diagnosis, Treatments - WebMD

    Aug 4, 2025 · There are more than 400 types of anemia, and they can be caused by a variety of factors — everything from blood loss to abnormalities in the way your cells are formed.

  4. Common and Rare Causes of Anemia - Healthline

    Aug 19, 2025 · Here's all about what causes anemia and what factors increase your chance of developing this condition.

  5. Anemia - Causes and Risk Factors | NHLBI, NIH

    Dec 18, 2025 · You may develop anemia if your body doesn’t make enough red blood cells or loses too many red blood cells. Red blood cells contain hemoglobin . Hemoglobin is an iron-rich protein that …

  6. Why Am I Anemic? Iron, B12, and Other Key Causes

    3 days ago · Anemia has many causes, from low iron and B12 to chronic illness and genetics. Learn what’s behind yours and why getting the right diagnosis matters.

  7. Anemia: Symptoms, types, treatment, causes, diet, and more

    Jul 4, 2025 · Iron deficiency anemia is the most common form of anemia, and blood loss is often the cause. Blood loss can lead to low levels of iron in the blood, causing anemia. When the body loses …

  8. Anemia – Types, Symptoms, and Causes | Penn Medicine

    There are more than 400 types of anemia, each with different causes ranging from iron deficiency, blood loss, or damaged red blood cells to issues with red blood cell production. Some of the most common …

  9. Anemia Overview - Harvard Health

    Mar 4, 2026 · Anemia can occur when the bone marrow does not produce enough red blood cells to replace those that have died. Or it can occur if the red blood cells die or are destroyed more quickly …

  10. What Could Be Causing Your Anemia? 10 Possible Reasons

    Jul 16, 2024 · There are many types of anemia, but they can all be grouped by their three causes: blood loss, destruction of red blood cells, and faulty or decreased blood cells.