Which symptoms may warrant an unscheduled landing?

Uncontrolled bleeding and failure to regain consciousness are critical symptoms that may necessitate an unscheduled landing. When a person is experiencing uncontrolled bleeding, it indicates a potentially life-threatening situation that could lead to shock or severe medical complications if not addressed immediately. Similarly, failure to regain consciousness points to a serious underlying issue such as a concussion, stroke, or other neurological emergencies, which require urgent medical attention. Both situations represent imminent threats to health that cannot be managed effectively in-flight, thereby making an unscheduled landing essential to ensure the passenger receives immediate medical assistance.

The other options, while they may indicate some level of discomfort or injury, do not represent the same level of urgency. Persistent pain and minor cuts, for instance, are usually manageable within the capacity of in-flight resources. Minor distress and fatigue, as well as passenger complaints and discomfort, do not typically present immediate dangers to life or health and can often be addressed with standard first aid or reassurance from the crew. Hence, the symptoms in the correct answer highlight serious emergencies that require swift intervention.