If you can’t cough up phlegm in your throat due to a foreign body sensation, you need to target treatment according to the cause, and the common causes include pharyngitis, laryngitis, diphtheria and so on. 1. pharyngitis: pharyngitis caused by a foreign body sensation in the throat with phlegm coughing, you can use the compound borax gargle gargle, Dumifen tablets orally, and other local medications for treatment; bacterial infections can be discretionary antibiotics, such as ampicillin, amoxicillin, and so on. 2. Laryngitis: laryngitis caused by foreign body sensation in the throat with phlegm coughing can be taken medication, commonly used drugs such as bromhexine, aminobromine hydrochloride orally, but also budesonide suspension nebulizer inhalation, should be based on the condition of the specialist under the guidance of the doctor to choose the appropriate drugs and the way to give drugs. 3. diphtheria: diphtheria caused by a foreign body sensation in the throat with phlegm coughing can be used antitoxin and antibiotic treatment, such as diphtheria antitoxin, erythromycin, penicillin G and so on. It is recommended to actively seek medical attention to clarify the cause and standardize the medication and treatment under the guidance of the doctor, and not to blindly use the medication on your own to avoid delaying the condition.