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Diseases & conditions A-Z List

Diseases & Conditions A-Z List - «H»:

  1. Hemangioma Hemangioma
    A hemangioma is an abnormal buildup of blood vessels in the skin or internal organs. Causes About 30% of hemangiomas are present at birth. The rest appear in the first several months of life. The hemangioma may be: In the top skin layers (capillary hemangioma) Deeper in the skin (cavernous hemang...
  2. Hematocrit Hematocrit
    Hematocrit is a blood test that measures the percentage of the volume of whole blood that is made up of red blood cells. This measurement depends on the number of red blood cells and the size of red blood cells. The hematocrit is almost always ordered as part of a complete blood count. How the Test...
  3. Hemochromatosis Hemochromatosis
    Hemochromatosis is a disorder that results in too much iron being absorbed from the gastrointestinal tract. Causes Hemochromatosis occurs when too much iron builds up in the body. There are two forms of hemochromatosis: primary and secondary. Primary hemochromatosis is usually caused by a specific ...
  4. Hemoglobin Hemoglobin
    Hemoglobin is a protein in red blood cells that carries oxygen. A blood test can tell how much hemoglobin you have in your blood. See also: Hemoglobin electrophoresis How the Test is Performed Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The s...
  5. Hemoglobin C disease Hemoglobin C disease
    Hemoglobin C disease is a blood disorder passed down through families. It leads to a type of anemia, which occurs when red blood cells break down earlier than normal. Causes Hemoglobin C is an abnormal type of hemoglobin, the protein in red blood cells that carries oxygen. It is a type of hemoglobi...
  6. Hemoglobin derivatives Hemoglobin derivatives
    Hemoglobin derivatives are altered forms of hemoglobin, a protein in red blood cells that moves oxygen and carbon dioxide between the lungs and body tissues. This article discusses the test used to detect and measure the amount of hemoglobin derivatives in your blood. How the Test is Performed The ...
  7. Hemoglobin electrophoresis Hemoglobin electrophoresis
    Hemoglobin electrophoresis is a test that measures the different types of the oxygen-carrying protein (hemoglobin) in the blood. How the Test is Performed Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medici...
  8. Hemoglobinopathy Hemoglobinopathy
    Hemoglobinopathy is a group of disorders passed down through families (inherited) in which there is abnormal production or structure of the hemoglobin molecule. Such disorders include hemoglobin C disease, hemoglobin S-C disease, sickle cell anemia, and various types of thalassemia. ...
  9. Hemoglobinuria Hemoglobinuria
    Hemoglobin is a molecule attached to red blood cells that helps move oxygen and carbon dioxide through the body. Red blood cells have an average life span of 120 days. After this time, they are broken down into parts that can make a new red blood cell. This typically takes place in the spleen, bone ...
  10. Hemolytic anemia Hemolytic anemia
    Hemolytic anemia is a condition in which there are not enough red blood cells in the blood, due to the premature destruction of red blood cells. There are a number of specific types of hemolytic anemia, which are described individually. Causes Hemolytic anemia occurs when the bone marrow is unable ...
  11. Hemolytic anemia caused by chemicals and toxins Hemolytic anemia caused by chemicals and toxins
    Hemolytic anemia caused by chemicals and toxins is a lack of enough red blood cells due to the destruction of red blood cells triggered by exposure to certain chemicals or toxins. Causes Possible substances that can cause hemolytic anemia include: Anti-malaria drugs (quinine compounds) Arsenic Da...
  12. Hemolytic crisis Hemolytic crisis
    Hemolytic crisis occurs from the rapid destruction of large numbers of red blood cells (hemolysis). The destruction occurs much faster than the body can produce new red blood cells. Considerations A hemolytic crisis causes acute (and often severe) anemia, because the body cannot make enough red blo...
  13. Hemolytic-uremic syndrome Hemolytic-uremic syndrome
    Hemolytic-uremic syndrome (HUS) is a disorder that usually occurs when an infection in the digestive system produces toxic substances that destroy red blood cells, causing kidney injury. Causes Hemolytic-uremic syndrome (HUS) often occurs after a gastrointestinal infection with E. coli bacteria (Es...
  14. Hemophilia Hemophilia
    Hemophilia refers to a group of bleeding disorders in which it takes a long time for the blood to clot. Related topics: Hemophilia A Hemophilia B von Willebrand disease Causes Blood clotting factors are substances in the blood that help form a clot. When one or more of these clotting factor...
  15. Hemophilia A Hemophilia A
    Hemophilia A is a hereditary bleeding disorder caused by a lack of blood clotting factor VIII. Without enough factor VIII, the blood cannot clot properly to stop bleeding. Alternative names Factor VIII deficiency Causes Hemophilia A is caused by an inherited X-linked recessive trait, with the defec...