<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, I got off an 8 hour flight yesterday morning and one of my legs feels slightly numb pins and needles. Pacticularly behind my knee and lower thigh. It is not painful and I am not in a risk group for DVT I am 23, not overweight,on no medication but I was wearing long socks under my jeans, which got a little tight and uncomfortable so I took them off about 3 hours in. My legs were a little swollen but that has now gone down. What would you recommend?  <response>: Hello, In lengthy flights, due to immobility recurring pain, numbness or swelling in the legs are indicative of a circulatory problem, clotting disorders, varicose veins, family history of obesity. You are suggested to do simple stretch exercises. Foot knee lifts, ankle flexes rotations. While in long flights take seats with extra legroom so that you can be more comfortable. Wear light fitting clothes while on a flight. Avoid caffeine and alcohol or addictions if any. You are suggested to visit ER get physically examined, your treatment will depend upon the pathology detected. Hope I have answered your query. Let me know if I can assist you further. 