Haircuts 2014 - Pictures Of Menstrual Blood Clots, Menstrual blood problems: clots, color, and thickness, If your menstrual blood varies in color and consistency throughout your monthly period, it's likely that it's perfectly normal. there are times, though, when changes. What are the causes of menstrual blood clots? | ehow, Endometriosis is a painful condition, which causes numerous unpleasant symptoms, including the ping of blood clots. according to endometriosis.co.uk (see resources.