Why might poor health increase risks for a diver?

Poor health can significantly increase risks for a diver primarily because it can lead to complications during dives. Health issues may impair a diver's physiological ability to cope with the pressures and challenges associated with diving. For example, respiratory problems can hinder proper air intake and gas exchange, increasing the risk of hypoxia or hypercapnia. Cardiovascular issues can also lead to serious events, such as heart attacks or arrhythmias while under the stress of diving conditions.

When a diver encounters difficulties due to poor health, this can manifest in various forms, such as difficulty equalizing pressure, increased fatigue, or impaired cognitive function, all of which can compromise safety and decision-making ability underwater. The importance of being in good health before diving cannot be overstated, as any pre-existing condition can exacerbate the physiological stresses experienced during a dive.