Patients with cold can drink orange juice. Cold is the abbreviation of acute upper respiratory tract infection, mainly because the body’s immunity is reduced by the invasion of viruses, bacteria and other pathogens, causing inflammatory changes in the mucous membrane of the upper respiratory tract, and the body’s immunity is relatively poor. Orange juice contains very high concentration of vitamin C, which can improve the immunity of the body, because vitamin C is one of the important raw materials involved in the immune response of immune cells. In addition, vitamin C can reduce the permeability of airway capillaries and reduce the pathological state of congestion and edema. Moreover, orange juice contains a large amount of water, which can clear the throat, benefit the throat and moisten the lungs, and has a certain effect on relieving the symptoms of cough and phlegm of cold.