What are common signs of a blood clot?

Depends: It depends where it is. In your brain, could be severe stroke like symptoms, in lung...Palpitations and shortness of breath or painful respirations, in leg...Swelling of leg, pain, etc.

DVT: Signs of a blood clot in the leg, or dvt, would include pain, redness and swelling of the extremity. On exam, pain would be reproduced with calf compression and possibly on ankle joint range of motion. If you are concerned, i would recommend evaluation as soon as possible.