Every man who cuts himself shaving knows the bleeding time will be limited, but the formation of a clot of blood can be a very serious complication.
For example, a clot in the the circulation of the brain or in the small coronary arteries - which keep the muscles of the heart supplied with blood - can produce either a stroke or, in the case of the heart muscle, an attack known as a coronary.
Quite often in these conditions, or if a clot forms in the lungs or veins of the lower limb, anticoagulants are prescribed to make it more difficult for the blood to clot.
But, obviously, there must be a limit to the slowing-down of the clotting rate. Carried to excess it can mean that bleeding goes on for far too long.
Many articles taken from 'A word with the doctor', by Dr. John Windsor.