I've never had blood clots and I don't worry about them, but, my Mom has blood clots in her arms - called Deep Vein Thrombosis. Her symptoms were swollen arms and very swollen hands with very swollen veins in her hands. She had pain and aching in arms and hands along with red flushed skin. Her skin on her arms and hands also felt hot to the touch. My Mom knew something was definitely wrong. Also, she had an ultrasound that found the clots right away. I hope this eases your mind a little bit as it seems you don't have these symptoms.