Whether it's your child who is experiencing medical problems, or another member of the family, it's important to let your child's school know what is going on. In the event that it is your child who is facing medical challenges, the school can be a valuable resource to you in providing a record of observable changes. In addition, in the event that your child is on medication, it's important for the school to be aware of that, as well.
In the event that you, or another close family member, are experiencing medical problems, your child's teachers should be informed so that they can be alert to any changes in your child's behavior that may be connected to his or her anxiety level.