Bright red blood and dark red blood, which need to be analyzed according to different bleeding sites, as well as bleeding conditions, can be roughly divided into two categories according to external bleeding and internal bleeding, as long as there are different bleeding symptoms than before, you need to go to the hospital for examination and evaluation, as well as early detection of the disease. External bleeding: If the bleeding is from arterial trauma, the blood color is usually bright red and jet-like; if the bleeding is from venous trauma, the blood color is dark red and will not be jet-like. Second, internal bleeding: 1, nasal bleeding: nasal bright red blood suggests a short period of nasal injury; nasal dark red blood suggests that blood stagnation in the nasal cavity for a longer period of time, nasal bleeding common causes are nasal dryness, inflammation and nasal septal deviation; 2, oral bleeding: oral coughing bright red blood, usually the throat or tracheal bleeding, blood in the bleeding part of the short stay that is coughed out; oral vomiting dark red blood. Vaginal bleeding: bright red blood from the vagina is divided into menstrual bleeding and non-menstrual bleeding; bright red blood from the menstrual period is due to more bleeding and faster blood flow, thus appearing bright red, which is a normal physiological condition; bright blood from the non-menstrual period may be ectopic pregnancy or pre-miscarriage. Dark red blood out of the vagina, may be the early menstruation blood flow is small, at this time it is easy to show dark; 4, anal bleeding: bright red blood stool usually have three conditions, hemorrhoids, low rectal cancer or vascular malformation; dark red blood stool bleeding location is higher, usually for the right half of the colon tumor, polyps, etc..