These blood clots can be formed due to:-
- Immobility which causes the blood to flow slowly making it more likely to clot (sitting for an extended period such as plan journey)
- Damage to lining of the vein will increase the likelihood of repeated blood clots
- Conditions that cause the blood to clot more easily (thrombophilia)
- The contraceptive pill and Hormone replacement tablets can increase risk of blood clotting
- People with cancer or those who are obese are more prone to blood clots