The presence of polyps can usually be clarified through endoscopy. If you want to check whether there are polyps in the stomach, you can have a gastroscopy, in which the doctor can observe the stomach and esophagus comprehensively. If you want to see if there are polyps in the intestines, you can take an oral laxative to clean out the intestines and observe them under the colonoscopy. If the patient’s tolerance of pain is relatively poor, painless colonoscopy can be performed, and the patient can check the colonoscopy in a more comfortable state. If you want to check the nasal cavity, you can do nasal endoscopy. If you want to check the larynx, you can check oropharyngoscopy or laryngoscopy, etc. However, if you want to check whether there are polyps in the small intestine, it is usually more difficult, and you need to perform upper gastrointestinal imaging or perform small bowel capsule microscopy, which is usually not directly observable. Therefore, if you feel unwell, you should go to the hospital as soon as possible in order to clarify the cause of the disease.