Diving while you’re sick is never a good idea. Sneezing in a dive mask is never a great experience and throwing up in a dive mask is even worse… Diving often causes extra pressure on the sinuses, so even having something as simple as a small cold can significantly worsen when on a dive. So, if you’re going scuba diving for the first time make sure you’re healthy so that you have a good time – rather than making yourself sicker in the process.