What are the clinical manifestations of upper respiratory tract infection in children?

　　In general, the clinical manifestations of upper respiratory tract infection in children include fever, cough, runny nose and nasal congestion, sore throat, and systemic symptoms. A detailed analysis is as follows:

　　1. Fever

　　Fever is a common symptom of upper respiratory tract infection. The child's body temperature may rise above 38℃, and some children may even experience febrile seizures.

　　2. Cough

　　Cough is one of the main manifestations of upper respiratory tract infection and may be accompanied by sputum production. The severity of the cough varies; severe coughing can affect the child's sleep and daily life.

　　3. Runny Nose and Nasal Congestion

　　In upper respiratory tract infections, inflammation caused by pathogens leads to nasal mucosal congestion, edema, and increased secretions, resulting in runny nose and nasal congestion. These symptoms may cause breathing difficulties in the child and affect appetite and sleep.

　　4. Sore Throat

　　Inflammation caused by pathogens leads to congestion, edema, and increased secretions in the pharyngeal mucosa, which can stimulate the nerve endings in the throat, potentially causing discomfort such as sore throat, dryness, or a foreign body sensation.

　　5. Systemic Symptoms

　　Systemic symptoms are caused by a generalized inflammatory response due to pathogen infection. Children may experience headaches, body aches, fatigue, and loss of appetite.

　　It is important to develop good hygiene habits in daily life, such as frequent handwashing, wearing masks, and avoiding contact with individuals who have respiratory infections. Additionally, maintaining fresh indoor air by regularly opening windows for ventilation can also help prevent upper respiratory tract infections.