Actually when you tell me that he has been sitting a lot more recently that tells me that it is wise to go to the doctor and request a test call a venous doppler study. This test will check for blood clots in the legs. If there are clots he would experience pain and numbness. Sitting a lot can actually cause clots to form. The test is an ultrasound and is not invasive. It does not take long and it would allow the doctor to see if blood clots are the cause of his discomfort. If it is blood clots then they would give him some medication to break up the clots and then he would be on medication to prevent blood clots from coming back. NEVER rub the legs when they hurt or are swollen that can make the clot travel up to his lungs. I hope this has helped you and good luck!