First, myocarditis If the child viral infection appeared pale, poor spirit, especially not fever when the limbs are cold, rapid heartbeat, some children will be accompanied by abdominal pain and vomiting and other gastrointestinal symptoms, parents should pay special attention to, must seek medical attention in a timely manner. Children may be complicated by myocarditis! Second, do not want to eat a cold, appetite is certainly poor, parents should not force children to eat, can be a light diet. After a cold, if a clean stomach, moderate hunger, in turn, easy to heal. On the contrary, if you think about supplemental nutrition, eat more things, so as to increase resistance, the result of food accumulation, in turn, will aggravate the cold. Third, otitis media incidence of about 10%. Otitis media is an acute purulent inflammation of the middle ear mucosa, infected by the Eustachian tube. After a cold, the inflammation of the pharynx and nose spreads to the Eustachian tube, and the mucous membrane of the Eustachian tube and the lumen of the Eustachian tube becomes congested and swollen, and the movement of the cilia is impaired, causing otitis media. Common pathogenic bacteria are mainly pneumococcus, Haemophilus influenzae and so on. Its symptoms are mainly earache and pus. The systemic symptoms in pediatric patients are more obvious than those in adults, and may include fever and vomiting. Serious complications are intracranial complications such as meningitis and brain abscess. Other complications are labyrinthitis, facial nerve paralysis and so on. Sinusitis If the cold is not relieved after a week, and the yellow pus keeps coming out, you need to consider sinusitis. Children do not know how to blow their noses, and when there is a lot of snot, it can flow into the mouth through the back of the nasal cavity and cause coughing. Sinusitis tends to recur in children because many of them also have a combination of diseases such as enlarged adenoids and are more susceptible to upper respiratory tract infections. The frontal and pterygoid sinuses usually begin to develop after the age of 2-3 years and are therefore involved later. Adenoid hypertrophy plays an important role in the development of sinusitis, due to adenoid hypertrophy blocking the posterior nostril so that snot drainage is not smooth, at the same time, adenoid tissue can hide bacteria and viruses, so it is the source of infection, therefore, in the adenoid hypertrophy accompanied by sinusitis in children, should be done first adenoidectomy, often after surgery, sinusitis is easier to treat. Five, laryngitis six, lower respiratory tract infections, such as tracheitis, bronchitis, pneumonia.