What is a hot flash?
A hot flash is a feeling of sudden intense heat on the upper body lasting anywhere from 30 seconds to several minutes or longer. (2)

What is a hot flash a symptom of?
menopausal transition (1)

How long can hot flashes last?
Hot flashes can last for many years. (1)

What can cause hot flashes?

When do hot flashes occur?
A hot flash can occur at night, and is called night sweats. (1)

1. https://www.nia.nih.gov/health/hot-flashes-what-can-i-do
2. https://www.verywellhealth.com/what-causes-hot-flashes-other-than-menopause-5186829