Yellow, thick and thick nasal mucus is not necessarily due to fever, but also to other causes such as chronic rhinitis. For example, wind-cold cold starts with cold and clear runny nose, which may be accompanied by soreness in the limbs and neck, but once it becomes hot, the clear runny nose will turn into yellow runny nose. In addition, summer heat and humidity colds can also have yellow and thick nasal mucus, and Yin deficiency colds can also have yellow and thick nasal mucus. Therefore, it is not possible to determine whether or not a cold is a hot one simply by the thick yellow nasal discharge. When patients have such symptoms, it is recommended to seek medical advice and apply the right medicine according to the disease. In daily life, we should pay attention to maintain nasal hygiene, change bad habits such as digging nostrils, and avoid spicy and stimulating diet. In addition, avoid smoking and alcohol, and exercise moderately to improve the immunity of the body.