On a few occasions I have had sudden pain in my wrist, when I looked at it the vein was bulging - looked as if it was ready to burst - then a few hours later the veins went down and bruising appeared immediately. Has anyone any idea what this might be. I didn't bump it against anything so that is not the cause. Didn't want to bother the doctor, but just wanted to know if anyone else ever experience anything similar and what causes it? It can be pretty frightening when the vein is bulging up and I am a bit concerned as it happened again today. Thanking you.