For someone who is dealing with a temporary issue like the flu or a broken foot, saying 'Get well soon!' is appropriate. Thinking about the person you are sending the card to and what situation they are facing is very important.
Here are some things to remember when you're writing your card. However, the one thing that these situations have in common is how appreciated your mail will be. They've probably heard 'Get Well Soon' 100 times already - how monotonous can you get? Also, illnesses range from the common cold, to a broken arm, to a terminal disease, so the get well soon wording won’t apply to everyone. Sometimes it can be difficult to think of what to say to someone who is sick. This is why writing a get well soon message to loved ones who are hurting can be a powerful tool to perk their spirits and make them feel thought of. When you feel sick it sometimes seems as if nothing we do can make the pain or suffering ease. Unfortunately, at one point or another, each of us has experienced being ill or injured.