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“In seventh grade, I was diagnosed with vasovagal syncope,” Brownlee explained after the incident.

Although vasovagal syncope is typically harmless and requires no treatment, a physician may instruct a patient to increase his or her fluid and salt intake, and sit or lie flat if these symptoms occur.

The most common cause of fainting is due to what physicians term vasovagal syncope.

When vasovagal syncope is occurring, patients like Jessica will experience warnings signals that include dizziness, headache, nausea, sweating, paleness, feeling warm or hot, and vision and/or auditory changes.

Ms. Joel’s spokeswoman, Claire Mercuri, said in an email on Monday that doctors diagnosed the cause of Ms. Joel’s collapse as vasovagal syncope, which causes a sudden drop in blood pressure and heart rate, and a reduced flow of blood to the brain.