Schwartz hit her head as she fainted and was hospitalized with a head injury. In a Tuesday interview, the meteorologist explained the medical diagnosis behind her health scare.

Doctors diagnosed Schwartz with Vasovagal syncope, the most common cause of fainting. 

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A Vasovagal syncope event happens when your body "overreacts to certain triggers, such as the sight of blood or extreme emotional distress," according to Mayo Clinic.

Dehydration and skipping meals are also two risk factors for developing the condition Cedars-Sinai Hospital says.

The triggers can cause a person's heart rate and blood pressure to drop suddenly, which reduces blood flow to the brain and causes the person to faint.

Dizziness, clammy hands, blurred vision and nausea are common symptoms before passing out.

Schwartz explained that she felt fine up until about fifteen minutes before she went on-air. The weatherwoman said she started to feel a little nauseous but decided to "power through" the upcoming segment.

She had also skipped breakfast that morning and was a little dehydrated from drinking coffee.

Schwartz revealed she had previous fainting episodes before this. She was also diagnosed with a leaky heart valve nearly a decade ago, but she said this episode was unrelated as doctors told her she passed all her cardiac tests.

The meteorologist revealed she wished she had listened to her body's warning signs and laid down when she started to feel sick. She said the episode was a wake-up call to take better care of herself.  

She stressed to others the importance of getting enough sleep and staying hydrated.

"Sometimes we put ourselves last, we go go go, until something happens and then it's too late," Schwartz warned.

Fox News' Yael Halon contributed to this report.