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.
Flu is not a 'bad cold'. Each year, thousands of people die of complications after catching the flu. Find out how colds and flu differ. Colds and flu share some of the same symptoms (cough, sore throat), but are caused by different viruses. Flu can be much more serious than a cold. If you're generally fit and healthy, you can usually manage the symptoms of a cold or flu yourself without seeing a doctor. Look after yourself by resting, drinking non-alcoholic fluids to avoid dehydration and avoiding strenuous activity.