When you have a cold, it is appropriate to eat some watermelon, but you should be careful not to eat too much at once, as watermelon contains a relatively high amount of sugar. If you are coughing and have phlegm while having a cold, eating too much watermelon might contribute to the production of more phlegm and exacerbate the symptoms of the cold. Therefore, it is suggested that during a cold, everyone should also consider their own health condition and the severity of their illness when consuming fruits. As for any fruit, do not eat too much at once to avoid negatively affecting the recovery from the illness. It is also important to drink plenty of water during a cold, which is definitely beneficial, as drinking water can promote metabolism and eliminate toxins from the body, helping the illness to recover faster. Additionally, it is advised to actively cooperate with medical treatment to alleviate symptoms.