Hot flashes can be due to hormonal imbalances in females after menopause. If also can be due to Vitamin defeciency. Please get her blood sugar done too .
It could just be hot flashes that happen to us old ladies. It is caused by fluctuating hormones. - I usually just drink some very cold ice water with a little potassium and it goes away. I hope it's not arthritis.
it's actually "Rheumatoid arthritis (RA)"
I heard from a doctor on the TV that it's a symptom of Rheumatic Arthritis.
there's also something called "Rheumatic fever" an "overkill" response of the immune system that follows to an infection.
she should see a Rheumatologist