What, apart from menopause, can cause hot flashes?

Check your hormone levels. I had the same problem and it was my birth-control. I had been on the same dose and brand for five years with no problems. Then my hormones apparently started changing in my mi-twenties. I started to develope hot flashes and they got worse over time. My doctor said this was normal and I changed pills. No problems since. Those flashes are real fun in public places too.