Are wrist injuries common in Yoga?

I do "power yoga."

Yes, wrist injuries can be common in yoga, particularly in the more "agressive" styles. My best guess is that you're having some sort of alignment problem in poses like down dog, plank, etc-- poses that ask you to support a lot of your weight on your wrists.

Probably the safest thing to do is to find a yoga class that is called something like classical, hatha, or Iyengar and start using those to supplement your power yoga practice. A slower paced class with a heavy emphasis on alignment will help you avoid all sorts of injuries.

You could also try spending some time at home working on down dog and plank to find the right alignment in your arms. Make sure your hands are roughly parallel to each other and push down into the part of your hand between the thumb and the pointer finger-- there should be no space for someone to insert a finger under your hand in that area. Look at your arms and notice where the "pits" of your elbows face. Be sure that your arm is rotated in the shoulder socket so the insides of your elbows face each other. If your arms are rotated correctly in the shoulder sockets you will feel no discomfort in your wrists and you will feel great strength in the pose. Be sure your shoulders are moving down your back and not hunched up around your ears. Be very careful!!! If you choose to work on this at home use extreme caution so that you do not hurt your wrists. Give your wrists a chance to heal before you begin working them too much.

Good luck and namaste!

only if your doing it wrong

Nope. Yer pushing yourself too much.