We only realize the importance of our health when we get sick/ ill. There may be a lot of causes of any disease such as germs, scarcity of food, air pollution etc. In order to diagnose a disease, it is important to observe the symptoms carefully.
Consider that the human body temperature is 98.6 Fahrenheit or 37 degree Celsius. Fever is when our body temperature rises from this limit. Cough is an instant response of body due to the soreness and scratchiness of the throat.
Fever is NOT a disease itself, but is a symptom of a disease.
Thermometer is used to measure the temperature of human body.
The coughing removes obstruction of windpipe i.e. mucus of windpipe.
Flue is a disease as well as symptom of many diseases.
The bacteria and viruses present in the human nose are expelled out due to sneezing.
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