While I was sleeping, I was awakened by a pain (something like a cramp) but it appeared to be coming from the veins on the inside of my thigh, it wasn t a muscle cramp, it felt as if it was inside of my vein, and the pain was harsh to say the least, I tried to rub it, but the pain persisted for several minutes, then slowly went away, I thought it was a blood clot or something going on inside of my veins.