I tested as 6x the average risk of developing DVT at 23andme (average risk is about 10%). I don&#x27;t see pulmonary embolism listed in my report.<p>I&#x27;m &quot;middle-aged&quot; but so far haven&#x27;t had this happen, despite some extra risk factors - I&#x27;ve been on the Pill for ~20 years and I do sit a lot (I&#x27;m a software developer). I&#x27;m not a frequent flyer, but I have flown many times and never had a problem. I naturally shift position pretty often when sitting, so I&#x27;m not sure if this helps. Or maybe whatever gene is responsible is just there, and hasn&#x27;t turned on yet. How to stop it from turning on? I don&#x27;t think anyone knows.<p>I was surprised to see that OP got a DVT when he walks 1-3 miles every day. That seems far better than what most people do (I try to walk about 2-3 mi per day). I don&#x27;t see how switching to running could be more preventive.