1. He became interested in blood clotting after his son required heart surgery. 2. He had a severe reaction to anti-inflammatory medication, which caused blood clotting . 3. Aspirin interferes with blood clotting and can cause bleeding and digestive ulcers. 4. Platelets, or thrombocytes, are disk-shaped blood elements which aid in blood clotting . 5. By having too much prothrombin, it increases the chances the blood clotting . 6. Sickle cell disease can cause severe pain, swelling, blood clotting and fatigue. 7. Four of the six patients had modest increases of blood clotting protein. 8. Blood clotting has twice threatened the career of Houston Rockets'center Hakeem Olajuwon.9. Doctors suspected a rare blood clotting disorder, but tests came back negative. 10. Blood clotting has twice threatened the career of Rockets center Hakeem Olajuwon.