“There is no scientific basis for the claim that oranges can relieve cough and reduce phlegm. Although oranges are rich in vitamins such as vitamin C, minerals and water, eating oranges can replenish the body’s nutrients, but oranges do not have the effect of cough phlegm. If you eat cold oranges may also irritate the mucous membrane of the pharynx to cause throat symptoms, and if the intake of orange sugar is too high, it will lead to the production of a large amount of phlegm, so that the phlegm of the viscous increase, will aggravate the symptoms of cough and phlegm. Cough and phlegm can be caused by many reasons, such as bronchitis, tuberculosis, lung tumors, reflux esophagus disease, acute left heart failure and other diseases, you need to clarify the cause of the disease, for the cause of the treatment, such as bronchitis using antibiotics, and then symptomatic treatment, the use of cough and phlegm medication, such as carboxymethyl stannum granules, licorice tablets and so on. When the symptoms of cough and phlegm are found, it is recommended to go to the hospital for examination in time to find out the cause, and use medication under the guidance of the doctor.