What is a common indication that divers should monitor for decompression sickness?

Monitoring for decompression sickness is crucial for divers, as it can arise when there is a rapid ascent from depths, leading to nitrogen bubbles forming in the bloodstream and tissues. Joint pain and fatigue are common symptoms of decompression sickness, often referred to as "the bends."

Divers experiencing these symptoms may feel pain in their joints, which can be intense and is often accompanied by a general sense of exhaustion. This is indicative of potential nitrogen saturation in the body and is a strong signal that a diver needs to seek assistance. The awareness of these physical symptoms is pivotal in diving safety, as early detection and treatment can prevent more severe complications of decompression sickness.

In contrast, the other options do not typically correlate with decompression sickness. Enthusiasm and energy boost, rapid heartbeat and excitement, or increased awareness of surroundings do not signal the onset of this serious condition and may even mislead divers into underestimating the need for safety protocols. Recognizing and understanding the signs associated with decompression sickness enables divers to make informed decisions and maintain their safety underwater.