Hot flashes and nausea are most commonly caused by hormonal imbalances in the body, most notably, by sex hormones. For women, a decrease in estrogen is often to blame, whereas in men, testosterone deficiency can create the problem. Sometimes, the symptoms occur for reasons not related to those hormones at all.
Flu symptoms can be similar to those of a cold, although they tend to be more severe. Symptoms can include: 1  dry, hacking cough. 2  moderate-to-high fever (although not everyone with the flu will run a fever). 3  sore throat. 4  shaking chills. 5  severe muscle or body aches. 6  headache. 7  stuffy and runny nose.
It is common to confuse flu with a bad cold. Flu and cold symptoms may include a runny/blocked nose, sore throat, and cough. Here are some symptoms which a person with flu will have (note that these are not common heavy cold symptoms): A high temperature, headache and fatigue are all possible symptoms of flu. 1  high temperature. 2  cold sweats, shivers.