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.
Colds and flu are both viral infections, but have different symptoms. With a cold you will have symptoms such as a runny nose or a sore throat. Flu symptoms come on suddenly and may include fever, body aches or vomiting. While there is no cure for either, there are treatments -- chicken soup, nasal sprays, rest -- which can help your feel better.