I had a dvt in my right leg from behind my knee to my ankle last August. Was on warfarin for 3 months and am doing fine now. Doctor says if I have another dvt will be on anticoagulant for life. Cause of my dvt was a double genetic mutation. I love to travel and especially enjoy cruises, but am nervous about flying and have seen some posts about injections of heparin type substances prior to flights. Also, I get ankle swelling while travelling and this happened even before the dvt. Can anyone give me insight on injection prior to flights and if the ankle swelling might have been a precursor of some sort to the dvt. Thank you for any info you may have.