Category: H

Abnormal deposition of an iron-containing compound (hemosiderin) in tissues, often associated with diseases in which there is extensive destruction of red blood cells. Increased storage of iron in body tissues; associated with diseases involving the destruction of red blood cells; for example, hemolytic anemia. A disorder caused by excessive deposition of iron, which in turn…

Swelling of a vein or veins (varicosity) in the lower rectum or anus, either internal, above the anal sphincter, or external, outside the anal sphincter. Frequently associated with constipation, straining to defecate, pregnancy, or prolonged sitting, hemorrhoids are often painful and sometimes bleed with defecation. Treatment includes topical agents to shrink and anesthetize the hemorrhoids,…

Any of several kinds of arbovirus (e.g., transmitted by insects or crustaceans) infection usually occurring in a specific geographic area; symptoms include fever, malaise, and respiratory or gastrointestinal symptoms, followed by capillary hemorrhage.    

Substance that breaks down or dissolves red blood cells. Hemolysins are found in some bacteria, venom, and foods. A substance capable of bringing about destruction of red blood cells (hemolysis). It may be an antibody or a bacterial toxin. A toxic agent or condition that destroys red blood cells. A substance that releases hemoglobin from…

Any of a group of inherited disorders characterized by an alteration in the normal structure of hemoglobin. Types of hemoglobinopathies include sickle-cell disease and thalassemia. Inherited disorders involving abnormal hemoglobin molecules. Abnormal hemoglobin is generally less efficient than normal hemoglobin at carrying oxygen to the cells of the body. People with hemoglobinopathies may have mild…

Presence of excessive hemoglobin in blood plasma. The presence of hemoglobin in the blood plasma.  

Secretion of sweat containing blood; also called hematidrosis.  

Abnormally low number of red blood cells in the blood.  

Tumor or swelling caused by leakage of blood from blood vessels, especially a swelling of the membrane covering the testis. A swelling caused by leakage of blood into a cavity, especially that of the membrane overlying the front and sides of the testis. A parametric (pelvic) hematocele is a swelling near the womb formed by…

Bleeding into a joint or joint cavity, causing pain and swelling of the joint area; may result from injury or certain diseases (e.g., hemophilia). Blood in the joint cavity from blunt trauma or penetrating wound, or occurring spontaneously in hemophiliac patients. The presence of blood within a joint, usually the result of a moderately severe…