You should never feel pain when performing any exercise. If you continue to feel pain, you should discontinue or modify that exercise, and seek the guidance of a medical professional. Movements that are performed incorrectly or in excess can cause inflammation. Reconsider the form that you are using when performing yoga exercises that involve arm balances. Keeping the wrist bent for prolonged periods of time can cause inflammation to the muscles and tendons that surround a joint. Yoga poses that require you to bear weight on the wrists will need to be eliminated or modified if you are currently experiencing pain. Instead of bearing your weight on the wrist, keep your elbow bent and place your weight on the forearm. This will take the pressure off of your wrist and allow it to heal. Another alternative is to keep the wrist straight and place your weight on your knuckles as you keep the hand clenched. Also, balance your yoga routine by decreasing the number of arm balances.