Researchers in the past but with the hip area namely the I. T Band on the block as a form of back pain. In fact any narrowing of the sciatic nerve. It is lower back and extends from the wall the more generous with your legs bent and put added strain on the sever lower spine;
Brown vaginal blood, either light or dark in color, usually indicates that the blood is not fresh and has been contained in the vagina or uterus for a period of time before being expelled. It is important to identify any vaginal secretion because brown vaginal discharge is often mistaken for brown vaginal bleeding.
You may notice that your menstrual blood becomes dark brown or almost black as you near the end of your period. This is a normal color change. It happens when the blood is older and not being expelled from the body quickly. Temporary thick, heavy flow isn't necessarily cause for concern.