The vitreous body itself has no blood vessels, and the blood in the vitreous body comes from the rupture of blood vessels or hemorrhage from new blood vessels in its adjacent intraocular tissues such as the retina, iris, and ciliary body. Therefore, strictly speaking, vitreous hemorrhage should be called vitreous hemorrhage. Vitreous hemorrhage can have various causes, including ocular trauma, retinal vascular diseases such as diabetic retinopathy, retinal vein obstruction, and retinal vasculitis are some of the common causes. Posterior vitreous detachment tearing the retinal vessels is also a common cause of vitreous hemorrhage. Certain systemic diseases such as hematologic diseases and intracranial hemorrhage can also lead to vitreous hemorrhage. The consequences of vitreous hemorrhage vary from case to case, and treatment should be appropriate according to the primary cause, the amount of vitreous hemorrhage, the absorption of the hemorrhage, and the presence of elevated intraocular pressure, proliferative lesions of the fundus, retinal detachment, etc.