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.
Cold symptoms typically begin with a sore throat that may be mild or severe. After a day or two, the sore throat improves and nasal symptoms, such as congestion or a runny nose, appear. Nasal secretions begin as a thin and watery discharge, then develop into a thicker and darker discharge several days into the illness.
It's not the same as the common cold. Flu is caused by a different group of viruses and the symptoms tend to start more suddenly, be more severe and last longer. Some of the main symptoms of flu include: 1  a high temperature (fever) of 38C (100.4F) or above. 2  tiredness and weakness. 3  a headache.