The blood possesses the property to clot, that is, to change into a thickened mass of blood. Normally, the blood flows through the blood vessels freely but sometimes blood clots are formed and they obstruct its easy flow. Such a clotting or sudden blocking of passage is technically called thrombosis (formation of thrombi) The blood usually clots after escaping from the blood vessels. The Human blood escaping from the organism clots within 3 to 4 minutes. 
 

If a clot gets into any of the arteries carrying blood into brain and cut off the oxygen supply, the brain cells are damage to the particular part  of the brain may cause rapture cerebral, hemorrhage  or paralysis.

Martial Art’s Acupressure can help rebalance the body by dissolving the clot.