Which of the following indicates someone may be choking?

The indication that someone may be choking is primarily shown through difficulty breathing and a change in skin color, such as the lips turning blue. When a person is choking, the airway becomes obstructed, which prevents adequate airflow to the lungs. This results in struggles to breathe, often accompanied by symptoms like wheezing or gasping. The oxygen deprivation can lead to cyanosis, which is the bluish coloration of the lips and sometimes fingertips, indicating that the person's oxygen levels are dangerously low and immediate assistance is required.

This response highlights a critical sign of choking and the physiological responses associated with oxygen deprivation, making it vital to recognize in emergency situations. Recognizing these symptoms can be life-saving, as it prompts quick intervention such as performing the Heimlich maneuver or calling for medical help.