Symptoms of DVT in the leg are: throbbing or cramping pain in 1 leg (rarely both legs), usually in the calf or thigh swelling in 1 leg (rarely both legs) warm skin around the painful area red or darkened skin around the painful area swollen veins that are hard or sore when you touch them These symptoms can also happen in your arm if that’s where the blood clot is. If you have any of these symptoms contact your GP immediately.