Colds can be categorized into common cold and influenza, both of which may cause diarrhea. The common cold is caused by rhinovirus, adenovirus and other infections, usually manifested as nasal congestion, runny nose, there can also be viral invasion of the gastrointestinal tract leading to gastrointestinal dysfunction, causing diarrhea, vomiting, loss of appetite and other digestive symptoms. Influenza is caused by the influenza virus, its gastrointestinal patients may have abdominal pain, bloating, vomiting and diarrhea and other digestive symptoms, children more than adults. In addition, diarrhea is not necessarily caused by colds, but can also be seen in acute gastroenteritis, colitis, food allergies, cholera and other diseases. If the symptoms of diarrhea do not improve or worsen, the patient needs to go to the hospital in time to complete a series of related examinations, to clarify the specific causes, and cooperate with the doctor for standardized treatment.