| | Conditions & Treatments | Blood Disorders Why does the blood clot in very large pieces during menustration? The blood does not clot in very large pieces during menstruation. Instead, it is typically shed as small pieces of tissue and fluid. Blood Disorders - Related Articles Who created blood banks? How to Donate Plasma in Tucson Name one material that passes from the blood into blood? What is mobia syndrome? If you have a perfect blood count does this mean your disease free? What if you are losing too much blood in your period? How do you improve your HCAHPS scores?