Originally Posted by stonehammer

just kidding around

serious answer - its the natural energy in your body and those that practise qi gong / internal kung fu / tai ji would be familiar with such feelings such as hands swelling up or warm/cold feeling around hands or a numb feeling or a slight vibrating feeling or a magnetic feeling..even feelings of energy coming to your hands and being mentally willed to stay around/in your hands/body

it really depends on the individual's current physical and mental state, needless to say, if you were already knocked out cold on the floor, you would not be feeling your hands swelling