A cold refers to what we commonly call an acute upper respiratory tract infection. It is mostly caused by viruses and bacteria infecting the upper respiratory tract, resulting in symptoms like coughing up phlegm. For example, symptoms may include sore throat, hoarseness, runny nose, teary eyes, fever, and other symptoms. All of these are referred to as a cold. After a cold, a fever may occur. Generally, if the body temperature exceeds 38.5°C, fever reduction treatment is necessary. If there are no medications available and the body temperature is quite high, drinking warm water, alcohol rubs, or warm water bathing can be used to reduce the temperature. If the body temperature is below 38.5°C, we can try to lower it to normal by drinking water and monitoring the body temperature frequently.