In the case of a cold, it's appropriate to eat some watermelon, but not too much. Since watermelon is cooling in nature, eating too much may cause discomfort in the digestive system, so it should be consumed in moderation. However, during a cold, it is best to follow a doctor’s advice and take medication for treatment. If it's just a common cold with minor symptoms like a runny nose, sneezing, and nasal congestion, it should be allowed to heal on its own. It is self-limiting and will generally resolve within about seven days without intervention. This is important to remember. Also, daily life and diet should be light, avoiding spicy, greasy, and raw or stimulating foods. It's important to maintain a relaxed mood, avoid excessive stress, and actively cooperate with the doctor’s treatment.