<s>[INST] I have had pain and slight swelling in behind my knee off and on for the past several days. Tonight it hurts badly again, and my upper calf feels like it is cramping and has a bubbly sensation. I had hardware removal surgery on my ankle 6 weeks ago and had PT today, so this may be muscle fatigue, but should I be concerned about something more serious like DVT? [/INST] Hi, thank-you for providing the brief history of you. A thorough musculoskeletal assessment is advised. As mentioned by you, that you had your PT session today, then it is just a fatigue of the muscle. So you need to wait and keep doing PT. On a later stage if the pain continues post 7-10 days than something has to be look forward to it. Also, I don't see any DVT causing factor in your history. So kindly continue PT and you will be on feet soon. RegardsJay In Chat Doctor.  </s>