A foreign body sensation with phlegm in the throat is usually able to be gastroscoped if it is not an acute episode of a disease such as acute pharyngitis. However, due to the variability of individual conditions, it is impossible to generalize and a decision should be made after consulting a physician. Gastroscopy is an examination in which a slender tube is inserted into the human stomach and a camera carried by the tube is used to observe the overall condition of the stomach. If you are suffering from upper gastrointestinal symptoms such as epigastric discomfort, stomach pain, heartburn sensation, discomfort in swallowing, choking, belching (hiccups), and eructation (hiccups), you can undergo a gastroscopy to find out the cause of the condition. Patients presenting with a foreign body sensation in the throat with phlegm and no obvious contraindications can usually undergo gastroscopy. However, if the patient belongs to the acute or acute attack of chronic diseases, such as acute tonsillitis, pharyngitis, acute asthma attack, as well as cardiac arrhythmia, toxic heart failure, need to be contraindicated to take gastroscopy, so as to avoid accidents and damage to health. If the patient wants to carry out gastroscopy, need to combine their own situation, ask the doctor’s guidance. Before the examination, need to strictly abide by the precautions before gastroscopy.