It is a problem that confuses many people who are suspected of having vocal edema but do not know which tests to do. To clear up the confusion, the following is a list of tests that need to be done for vocal edema. Medical Endoscopy Minimally Invasive Surgery Endoscopy is an optical instrument that is sent into the body from outside the body through the natural cavity of the human body to examine the disease in the body, which can directly observe the lesions in the internal cavity of the organs, determine their location and scope, and can be photographed, biopsied or brushed, which greatly improves the accuracy of cancer diagnosis and can be used for certain treatments. Fiberoptic endoscopes use fiberoptic fibers to transmit cold light source, with small diameter and bendable, so that patients suffer less during examination. Endoscopes are now widely used, such as gastroscopy for stomach cancer, bronchoscopy for lung cancer and trachea cancer, esophagoscopy for esophageal cancer, sigmoidoscopy for rectal cancer and sigmoid colon cancer, cystoscopy for bladder cancer, laryngoscopy for laryngeal cancer, nasopharyngealoscopy for nasopharyngeal cancer, colposcopy for cervical cancer and vaginal cancer, etc. With the development of ultrasonic non-destructive testing technology and endoscopic technology, endoscopic measurement technology is now in full use in the industrial and medical fields. With the development of computer technology and image processing technology, the endoscope can now truly realize the advantages of its measurement technology. Endoscopic examination When examining patients, the traditional way often causes pain for the patient, while ENT endoscopy, the patient can be seated or semi-recumbent, the doctor will extend the ENT endoscope into the patient’s mouth, ear cavity, nasal cavity, and then carefully examine the parts that need to be understood, because the medical endoscope lighting is good, high definition, can clearly see the deep, narrow, can not be in the frontal mirror The structures that cannot be seen directly under the frontoscope. For example, the hooks in the middle nasal passage, the sieve vesicle, the opening of the maxillary sinus, the olfactory fissure, the opening of the eustachian tube in the nasopharynx, and the adenoid tissue. Electronic endoscopy No matter what kind of electronic endoscope, the image of the part it can observe must be clear and exquisite, the current electronic endoscope gradually tends to use the second method to install CCD, which undoubtedly increases the technical processing and process difficulty of CCD, with the continuous improvement and perfection of electronic endoscopy technology, the volume of high pixel number CCD will be smaller and smaller to meet the clinical needs of various fine diameter Electronic endoscopes have emerged, and can be involved in almost all areas of medical treatment. At the same time, the emergence of some electronic endoscopes with large apertures or double apertures and special devices such as lifting clamps, coupled with the development of a series of supporting auxiliary instruments, has opened up a broad prospect for the clinical application of minimally invasive electronic endoscopic surgery. At present, some clinical conditions can be treated by endoscopic or small incision methods instead of traditional surgery, greatly reducing the pain of patients.