Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «H»:
Hemorrhage: Bleeding or the abnormal flow of blood.
The patient may have an internal hemorrhage that is invisible or an external hemorrhage that is visible on the outside of the body. Bleeding into the spleen or liver is internal hemorrhage. Bleeding from a cut on the face is an external hemorrhag...
Hemorrhage, subarachnoid: Bleeding within the head into the space between two membranes that surround the brain. The bleeding is beneath the arachnoid membrane and just above the pia mater. (The arachnoid is the middle of three membranes around the brain while the pia mater is the innermost one.)
Hemorrhagic: Pertaining to bleeding or the abnormal flow of blood.
The patient may have an internal hemorrhagic problem that is not be visible or the patient may have an external hemorrhagic problem that is therefore visible on the outside of the body.
The term "hemorrhagic" comes from the Greek "h...
Hemorrhagic cyst: This type of functional cyst occurs when bleeding occurs within a cyst. Symptoms such as
abdominal pain on
one side of the body may be present with this type of cyst. ...
Hemorrhagic diarrhea, E. coli
Hemorrhagic diarrhea, E. coli: Bloody colitis (inflammation of the bowel) caused by E. coli, usually by the strain E. coli 0157:H7.
The diarrhea is severe with painful abdominal cramps, gross blood in the stool, and lasts for 6 to 8 days.
Most commonly, E. coli 01257:H7 comes from eating raw
Hemorrhagic fever with renal syndrome
Hemorrhagic fever with renal syndrome: A
number of diseases, also known as hemorrhagic fever, characterized by an abrupt onset of high
fever and chills, headache, cold and cough, and pain in the
muscles, joints and abdomen with nausea and vomiting
followed by bleeding into the kidney and elsew...
Hemorrhagic fever, epidemic
Hemorrhagic fever, epidemic:
A number of diseases characterized by an abrupt onset of high fever and chills, headache, cold and cough, and pain in the muscles, joints and abdomen with nausea and vomiting followed by bleeding into the kidney and elsewhere. Known
also as hemorrhagic fever with rena...
Hemorrhoid: A dilated (enlarged) vein in the walls
of the anus and sometimes around the rectum, usually caused by
untreated constipation but occasionally associated with chronic
The symptoms start with bleeding after defecation. If
untreated, hemorrhoids can worsen, protruding from t...
Hemorrhoidectomy: Surgical removal of hemorrhoids (enlarged and dilated veins in and around the rectum and anus). Hemorrhoidectomy is usually reserved for severe hemorrhoids if more conservative treatment measures fail to alleviate the symptoms (burning, itching, swelling, protrusion, bleeding, and ...
Hemorrhoids: See: Hemorrhoid....
Hemostasis: The stoppage of bleeding or hemorrhage. Also, the stoppage of blood flow through a blood vessel or organ of the body.
Hemostasis is the arrest of bleeding, whether it be by normal vasoconstriction (the vessel walls closing temporarily), by an abnormal obstruction (such as a plaque) or b...
Hemostasis, genetics of
Hemostasis, genetics of: Inherited factors that play a role in hemostasis, the stoppage of blood flow through a blood vessel.
There is genetic regulation of proteins involved in hemostasis and atherothrombotic disorders, including myocardial infarction and stroke. People with a family history of ...
Hendra virus: A virus, formerly called equine morbillivirus, that can cause illness in horses and humans. First identified in 1994 in Australia where the virus caused the death of two patients, one of pneumonia and the other of encephalitis that developed a year after the patient's initial exposure....
Henna: A coloring made from the leaves of the Egyptian privet, Lawsonia inermis. Approved only for use as a hair dye, not for direct application to the skin, as in the body-decorating process known as mehndi. This unapproved use of a color additive to henna makes these products adulterated and there...
Henoch-Schonlein purpura: See: Schonlein-Henoch purpura....