Acute bronchitis is often seen in patients with weakened immune systems, or who accidentally catch cold.

It frequently occurs in infants and young children who generally have lower immune functions. The invasion of pathogens into the respiratory tract can lead to various symptoms including fever, cough, phlegm, and breathing difficulties. During the acute phase of bronchitis, intense coughing due to the vigorous nature of the cough can increase gastric pressure. Therefore, sometimes after eating, patients may experience vomiting in conjunction with severe coughing. At this time, prompt treatment with anti-infection measures, cough suppression, and expectorants can naturally lead to improvement in vomiting.