Causes of Hot & Cold Flashes


Hot and cold flashes may be a symptom of a mild but annoying illness or of a more serious infection, and diagnosis by a doctor may depend on what other symptoms are also present. The flashes may be treated with home remedies, such as wearing clothing made of cotton and staying well-hydrated, although medical treatment may be necessary. Consider this information derived from the National Library of Medicine and the Mayo Clinic about this condition's causes.

Woman being fanned
Woman being fanned (Image: Goodshoot/Goodshoot/Getty Images)


Spending time in cold or hot climates can cause hot and cold flashes as the body tries to stabilize its internal temperature, according to the NLM.

woman at beach
woman at beach (Image: Jupiterimages/Brand X Pictures/Getty Images)


HIV is a sexually transmitted disease that may also cause these flashes, according to the Mayo Clinic. They can occur soon after becoming infected with HIV and be accompanied by other symptoms, such as fatigue and fever. They can also occur as HIV progresses and may include sweating at night and shaking during cold flashes.

woman taking temperature with thermometer
woman taking temperature with thermometer (Image: Jupiterimages/Pixland/Getty Images)


According to the NLM, certain types of short-term illnesses may cause hot and cold flashes, such as urinary-tract infections, gastroenteritis, vomiting, cramping and diarrhea.

sick woman in bed
sick woman in bed (Image: Stockbyte/Stockbyte/Getty Images)


Menopause can be a cause of hot and cold flashes in women. According to the NLM, a decrease in the amount of hormones are the cause, and there may also be accompanying vaginal dryness. Women over the age of 45 are most likely to be affected.

older woman
older woman (Image: Goodshoot/Goodshoot/Getty Images)

Personal Habits

According to the Mayo Clinic, women who are in perimenopause (the period approaching menopause) and who are overweight or obese are more likely to have hot flashes than women who are within a healthy weight range, as are women who smoke or have a sedentary lifestyle.

Woman smoking
Woman smoking (Image: Jupiterimages/ Images)

Respiratory Infections

Bacterial or viral respiratory infections may cause people to experience hot and cold flashes, according to the NLM. Viruses, including influenza and the common cold, as well as pneumonia and strep throat, may cause these symptoms, as well.

Woman blowing her nose
Woman blowing her nose (Image: Stockbyte/Stockbyte/Getty Images)

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