The nasal cavity and eyes are connected when crying, and the common channel is called the nasolacrimal duct. The secretion of tears increases, and the extra tears will flow down to the nasal cavity through the nasolacrimal duct, leading to an increase in nasal secretion, which feels like the outflow of nasal mucus. In addition to the symptoms of runny nose, the baby will also sneeze, cough and fever when crying, which may be combined with cold symptoms. If your baby has a runny nose when crying, don’t worry too much, it’s a normal physiological phenomenon, but if your baby also has sneezing, coughing, sore throat and fever when crying, it’s recommended to come to the hospital in time.