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.
Symptoms. Initially, the flu may seem like a common cold with a runny nose, sneezing and sore throat. But colds usually develop slowly, whereas the flu tends to come on suddenly. And although a cold can be a nuisance, you usually feel much worse with the flu. Common signs and symptoms of the flu include: Fever over 100.4 F (38 C) Aching muscles, especially in your back, arms and legs; Chills and sweats; Headache; Dry, persistent cough; Fatigue and weakness; Nasal congestion; Sore throat; When to see a doctor. Most people who get the flu can treat themselves at home and often don't need to see a doctor.