If you've never scuba dived before and intend to go ahead on your next trip, make sure to undergo a general health checkup before you leave your country. If you're usually active and healthy with no underlying complications, there need not be any great concerns. However, most operations will require you to approve a medical declaration before you start a diving course.
Even if you have certification to dive, never attempt a dive unless you are feeling 100 % up for it. Especially don't dive if are suffering from a head cold or after consuming alcohol