|This article does not cite any references or sources. (October 2013)|
Hematidrosis (also called hematohidrosis) is a very rare condition in which a human sweats blood.
Signs And Symptoms
Blood usually ooze from the forehead, other skin surfaces, nails, and umbilicus. In addition, oozing from mucocutaneous surfaces causing nose bleeds, blood stained tears, and vicarious menstruation are common. The episodes may be proceeded by intense headache and abdominal pain and are usually self limiting. In some condition, the secreted fluid is more dilute and appears to be blood tinged, while others may have darker bright red secretions resembling frank blood. 
Investigation such as platelets count, platelet aggregation test, coagulation profile and skin biopsy reveal no abnormalities and direct light microscopy of fluid demonstrate presence of normal red blood cells. Investigations also failed to show any vasculitis or skin appendages (I.e sweat glands, sebaceous glands and hair follicles) abnormalities. 
It may occur when a person is suffering extreme levels of stress, for example, facing his or her own death. Several historical references have been described; notably by Leonardo da Vinci: describing a soldier who sweated blood before battle, men unexpectedly given a death sentence, as well as descriptions in the Bible, that Jesus experienced hematidrosis when he was praying in the garden of Gethsemane (Luke 22:43-44).
This condition is very rare but reports of successful treatment with beta blockers (propranolol 10 mg)with significant reduction in the frequency of spontaneous blood oozing are described in medical literature. The successful use of beta blockers supports the theory that the condition is induced by stress and anxiety yet this etiology is not established yet as the high prevalence of stress and anxiety in the modern era did not change the incidence of this extremely rare disease suggesting that other co-abnormality also play a key role in this disease. Atropine sulfate transdermal patches where also used successfully.
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