your time on sky news. sky news. for a check on the weather. i could've my doctor my leg was red and swollen just doing the crossword... but i didn't wait. they told their doctors. and found out their symptoms... leg pain, swelling and redness - were deep vein thrombosis. a blood clot which could travel to the lungs and lead to a pulmonary embolism. which could cause chest pain or discomfort, or difficulty breathing - and be deadly.