The nasal discharge in case of cold originates from the nasal cavity. The cold is caused by various pathogens including bacteria, virus or mycoplasma and chlamydia infections, and the pathogens invade the human body causing congestion and edema in the respiratory tract and nasal cavity, increasing the permeability of capillaries, hence the manifestation of runny nose. The nasal discharge caused by viruses is clear watery, while most of the nasal discharge caused by bacterial infections is yellow and sticky. If there is a lot of runny nose, you can use pseudoephedrine nasal drops or anti-allergy medication, and make sure to drink more water and actively use anti-cold medication. During the treatment period, you should rest strictly, eat more light food and less spicy and stimulating food and barbecue, and the treatment period is about one week.