Normally, if you get hurt, your body forms a blood clot to stop the bleeding. Some people get too many clots or their blood clots abnormally. Many conditions can cause the blood to clot too much or prevent blood clots from dissolving properly.

Risk factors for excessive blood clotting include

• Certain genetic disorders
• Atherosclerosis
• Diabetes
• Atrial fibrillation
• Overweight, obesity, and metabolic syndrome
• Some medicines
• Smoking