In general, a poor stomach and intestines may cause a decline in physical fitness and easy to catch a cold. Gastrointestinal dysfunction can lead to decreased digestion and absorption of food, acid reflux, nausea, abdominal distension, vomiting, diarrhea, abdominal pain and other symptoms, which can cause malnutrition such as anemia, weight loss and other manifestations of the body, leading to a decline in the body’s resistance to bacteria, viruses, fungi and other infections and thus lead to disease. Cold, generally refers to the upper respiratory tract infection, is the acute inflammation of the nasal cavity, pharynx or larynx, including acute nasopharyngitis, viral pharyngitis, herpes pharyngitis, pharyngeal conjunctival fever and other diseases. The main manifestations are cough, nasal congestion, sneezing, runny nose, pharyngeal discomfort and other symptoms. The onset of the disease does not distinguish between age, gender, occupation and region, and is more frequent in immunocompromised, children and the elderly. Patients with poor gastrointestinal system have decreased body resistance and are prone to viral and bacterial infections, which lead to the occurrence of colds and flu, and it is recommended to consult a doctor in time for targeted treatment under the guidance of the doctor.