Cough, low fever, runny nose symptoms, can be considered to have upper respiratory tract infection, acute sinusitis or hand, foot and mouth disease and other conditions. 1. Upper respiratory tract infection: Upper respiratory tract infection can be caused by various pathogens, which can invade the nose, nasopharynx or pharynx and other parts of the body, and can cause local symptoms such as nasal congestion, runny nose, sore throat, cough, and systemic symptoms such as fever, headache, and fatigue. 2. Acute sinusitis: an acute purulent infection of the sinus mucosa. There are mainly symptoms such as nasal congestion, runny nose, olfactory impairment and rhinorrhea. If the nasal mucus flows backward into the pharynx and throat, it is easy to cause pharyngeal itching, coughing, coughing up phlegm and nausea. Systemic symptoms may include poor appetite, chills, fever and other symptoms. 3. Hand, foot and mouth disease: acute febrile rash disease caused by enterovirus, with children under 5 years of age as the main incidence of the population, common cases with acute onset of fever, as well as lack of appetite, cough, runny nose and other non-specific symptoms. Cough, low-grade fever and runny nose can also be caused by other diseases. If the symptoms are not relieved or worsened, it is recommended to go to the hospital in time, complete the examination, clarify the cause of the disease, and standardize the treatment under the guidance of the doctor.