An accumulation of blood that has leaked into the tissues from damaged blood vessels, usually as a result of an injury. Common hematomas are those occurring around fractures or in the tissues around the eye following a blow (the classic shiner). The most dangerous hematoma occurs beneath the outer membrane (dura) surrounding the brain following head injury.
The presence of blood in the urine, usually obvious, but sometimes the blood may not be visible to the naked eye and is only detected by microscopic examination of urine. The causes of haematuria include kidney stone or tumor, nephritis, cystitis, bladder tumors, inflammation, or tumors of the prostate gland. Blood in the urine should be immediately reported to the doctor for diagnosis of the cause and appropriate treatment.
A complex compound of protein and iron carried within the red blood cells, or erythrocytes. Hemoglobin, which carries oxygen from the lungs to the tissues, is the red pigment that gives blood its color.