Hemorrhage

v. bleed heavily, suffer a hemorrhage

n. profuse flow of blood, bleeding

Bleeding, technically known as hemorrhage (American English) or haemorrhage (British English) is the loss of blood from the circulatory system. Bleeding can occur internally, where blood leaks from blood vessels inside the body or externally, either through a natural opening such as vagina, mouth or rectum, or through a break in the skin. The complete loss of blood is referred to as exsanguination and desanguination is a massive blood loss. Loss of 10-15% of total blood volume can be endured without clinical sequelae in a healthy person, and blood donation typically takes 8-10% of the donor's blood volume.
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Hemorrhage /hem·or·rhage/ the escape of blood from the vessels; bleeding.hemorrhag´ic capillary hemorrhage the oozing of blood from the minute [more]Hemorrhage - Community and Resources

Noun
1. flow of blood from a ruptured blood vessels
(synonym) bleeding, haemorrhage
(hypernym) injury, hurt, harm, trauma
(hyponym) hemorrhagic stroke, haemorrhagic stroke
(derivation) shed blood, bleed
Verb
1. lose blood from one's body
(synonym) shed blood, bleed
(hypernym) discharge, expel, eject, release
(hyponym) menstruate, flow
(derivation) bleeding, haemorrhage

(n.)
Any discharge of blood from the blood vessels.