Hello. Thank you for posting.
It's not normal in the sense that you say it's happening lately and you feel off. See your doctor for a proper diagnosis if you are concerned. I don't know how old you are, but the average age for menopause is 51. Hot flashes can begin, for some women, as early as 10 years before menopause. That's because of the hypothalamus – the center of your brain that tells the pituitary gland what to do – becomes more sensitive to hormone fluctuations as you get older. Another cause might be Hypothyroidism. With hypothyroidism, body temperature tends to decrease because of a deficiency in thyroid hormone. A small rise or fall in thyroid levels can change the body temperature enough to significantly affect the levels of proteins in the bloodstream. Your body might be fighting an infection causing you to feel off, feeling cold then hot. These are just some examples of what can affect body temperature changes.