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. Symptoms of the flu generally begin more suddenly than those of a cold and they are more severe. Flu symptoms include a fever, sore throat, congestion, cough, muscle aches, general soreness, moderate to severe fatigue and headache.
The first few days of flu (Influenza) While flu shares many of the symptoms of the common cold, the early signs of flu are often a sudden fever, aches or pains, weakness or a loss of appetite. In particular, having a cough and a fever together can be a good indication that you have flu.