Webster's New World Medical Dictionary

193
hemoptysis
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hemorrhage
Abnormal bleeding. A hemorrhage
can be internal, and therefore invisible, or external,
and therefore visible on the body. For example,
bleeding into the spleen or liver is internal hemor-
rhage, and bleeding from a cut on the face is an
external hemorrhage. See also 
bleeding.
hemorrhagic fever, epidemic
See 
hemor-
rhagic fever, viral.
hemorrhagic fever, viral
A set of diseases
caused by viruses and characterized by the abrupt
onset of high fever and chills, headache, cold and
cough, and pain in the muscles, joints, and
abdomen, with nausea and vomiting. Abbreviated
VHF. One type of hemorrhagic fever is associated
with bleeding into the kidney (hemorrhagic fever
with renal syndrome) and is caused by hantaviruses
from the family 
Bunyaviridae.
Examples of viruses
known to cause hemorrhagic fever include the
arboviruses, the Marburg virus, and the Ebola virus.
Viruses associated with most VHFs naturally reside
in an animal host or arthropod vector and are trans-
mitted by the animal or insect host to humans. See
also 
arbovirus; Ebola virus; hantavirus.
hemorrhoids
Dilated (enlarged) veins in the
walls of the anus and sometimes around the rectum,
usually caused by untreated constipation but occa-
sionally associated with chronic diarrhea.
Symptoms start with bleeding after defecation. If
untreated, hemorrhoids can worsen, protruding
from the anus. Treatment involves changing the diet
to prevent constipation and avoid further irritation,
the use of topical medication, and sometimes sur-
gery. Also known as piles.