If it is sore when you move it is may be sprained. If there is a change of colour were you think you have sprained it. If it is warmer than the rest of your arm then you may have sprained it, to heal a sprained wrist, put ice on it but not directly as it may stick to your skin. Keep it above your heart. And rest it for two days. If the pain gets unbearable you should go to your doctor. He/she will ask you questions. They will X-ray it, they may give you a jab. Depending if it is easy to see what is wrong.