Not everyone is allowed to dive just anywhere, even if you have a diving certification. It is important that you are also fit and in some cases can demonstrate that. For example, each country has its own guidelines for medical examinations. As a rule, if you’re on medication, smoke, have had surgery, have lung, heart and vascular problems, or are over 50, you’ll need one. And let’s face it, many of us should have a medical exam. So check whether you need one and get yourself inspected in time.