You are also more likely to get a blood clot: • If you are very overweight • If you have had a blood clot before, or have had any blood clotting problem that needed treatment with a medicine such as Warfarin • If any of your close family has had blood clots • If you have had a miscarriage • If you are bed-ridden for a longer period through surgery, injury or illness • If you have systemic lupus erythematosus (SLE, autoimmune collagen disease, which may affect many organ systems)