This condition has been known to doctors for many years. Until recently it was beleived it only affected people of advanced years. It is now known it can strike at any age irrespective of physical fitness. Complications may arise that prove fatal. Anyone who sits in cramped conditions on a long-sistance aircraft, coach, train or car is particularly at risk. Preventative measures include wearing TRAVEL SOCKS. If properly fitted, compression socks can reduce the potential risk of D.V.T.