Sweating blood is rare.
It may occur in association with extreme physical or psychological stress or without an obvious risk factor.
It is also known as hematidrosis, hematohidrosis, and hemidrosis.

Kryssia Campos / Getty Images.
Medical management focuses on identifying and treating the underlying cause and easing the anxiety that sweating blood causes.
Some scholars suggest that sweating blood has been documented historically through artistic representations.
No diagnostic test can verify a diagnosis of hematidrosis.
What Is Colored or Dark Sweat?
Chromhidrosisand pseudochromhidrosis are conditions where the sweat is discolored due to fat material seeping through the sweat.
These conditions are not the same as hematidrosis.
Sweating blood is very rare, and its even more rare to have it recurrently.
How Is It Treated?
A few different therapies can treat sweating blood.
Because this symptom is rare and each individual’s situation is different, there is no established treatment protocol.
How Rare Is It?
There is no specific data regarding how often sweating blood occurs.
It is so rare that medical literature only offers a few case reports.
However, the blood loss in these cases has not been at a high enough volume to be life-threatening.
Summary
Sweating blood is extremely rare, with fewer than 100 cases described throughout existing medical literature.
If you or your child is sweating blood, seek medical attention immediately.
You may need medical tests to identify a possible cause.