Colds with phlegm in the throat and nausea and regurgitation may be caused by gastrointestinal colds, digestive disorders, and irritation from medications. 1. Gastrointestinal colds: Gastrointestinal colds are also a type of colds, and are considered to be related to infections such as coronavirus, influenza virus, and cupripovirus. The first symptom of gastrointestinal cold is gastrointestinal symptoms, which can cause nausea, regurgitation, vomiting and other manifestations. 2. Digestive system diseases: If you have gastrointestinal diseases, such as gastroenteritis and intestinal obstruction, the cold may lead to the aggravation of the original symptoms, which may cause coughing, coughing up phlegm, nausea and vomiting. 3. Stimulation of medication: If patients with stomach problems take medication during a cold, it may cause stimulation of the gastrointestinal tract, leading to nausea and vomiting. Colds accompanied by phlegm, nausea and regurgitation and other symptoms, it is recommended to go to the hospital for examination and treatment as prescribed by the doctor.