What causes sudden fainting in public spaces like concerts and subways?

Author: Jiang Yongyuan, Master's in Internal Medicine from Third Military Medical University. Review | Zhao Wei, Chief Physician of the Department of Neurology at Tianjin University TEDA Hospital, Young Member of the Sleep Disorders Committee of the Chinese Sleep Research Society. Title: What causes sudden fainting in public spaces like concerts and subways? Introduction: The article examines fainting causes like hypoglycemia and vasovagal syncope, urging better health management and awareness. Keywords: ['Health', 'Lifestyle'] Main text: On November 9, South Korean singer Kim HyunA suddenly fainted while performing on stage. Kim HyunA had previously mentioned on a show that she was diagnosed with vasovagal syncope and would faint several times a day.

The image comes from the internet. In daily life, such sudden fainting spells are not uncommon; many people have complained about fainting unexpectedly on the subway. Some individuals experience this due to low blood sugar, while others find that consuming sugar does not help. It is only after going to the hospital for examination that they discover the cause is vasovagal syncope. These seemingly random moments are actually the body signaling that it cannot take it anymore in three different ways—hypoglycemia and vasovagal syncope, with a condition that does not cause fainting but can lead to dizziness and palpitations—excessive sympathetic nervous system arousal.