The symptoms of a cold generally fall into three stages. Initially, the symptoms of a cold may be mild or even absent, such as slight sneezing, runny nose, or nasal congestion. In such cases, it is advised to drink plenty of water, promote excretion, and improve immunity, as the early symptoms are often mild or not obvious and hence overlooked. Later, the symptoms of a cold get more severe. During the mid-stage of a cold, symptoms may worsen, including cough, phlegm, sore or swollen throat, or itchy and dry throat. Body temperature may also rise slightly. At this stage, it is recommended to actively follow a doctor's advice and take appropriate anti-inflammatory and anti-infection medication, along with fever-reducing and cough-relieving drugs to alleviate the symptoms. In the later stages of a cold, symptoms may improve, for example, the phlegm may turn yellow and the headaches and fever may subside. Under these conditions, it is sufficient to continue taking medication under a doctor’s guidance for treatment.