Flexible Endoscopic Evaluation of Swallowing (FEES)

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What is Flexible Endoscopic Evaluation of Swallowing (FEES)?

Flexible Endoscopic Evaluation of Swallowing (FEES) is a specialised procedure used to evaluate a patient’s swallowing function. It involves the use of a thin, flexible endoscope equipped with a miniature camera and connected to a stroboscopic light source. This instrument is gently inserted through the nostril to provide a detailed view of the nasal cavity, nasopharynx (located at the back of the nose), oropharynx, and hypopharynx (the entire length of the throat) before focusing on the swallowing mechanism.


During the swallowing test, the patient is provided with food and liquids of various consistencies to swallow, with the endoscope in place within the nasal passage. This procedure allows the ENT specialist to closely observe the patient’s swallowing process, identifying any abnormalities or conditions that may cause dysphagia (difficulty swallowing).


This procedure is typically conducted within the confines of a clinic setting without local anaesthesia, as maintaining normal sensation in the nose and throat is necessary for an accurate assessment of the swallowing function. Registered as a day-surgery procedure, this treatment is eligible for reimbursement through Medisave or your personal insurance.

When Should You See an ENT Specialist in Singapore?

Please consult an ENT specialist if you are suffering from any ear, nose, or throat symptoms. It is also advisable to visit an ENT doctor if you experience persistent mouth breathing due to a chronic blocked nose or encounter snoring issues.

Dr Ker Liang sees adults and children for general ENT conditions and provides comprehensive management in a broad range of Ear, Nose, and Throat, as well as Head and Neck conditions. In particular, she specialises in treating throat and voice conditions, including persistent sore throat, voice issues, snoring, and Obstructive Sleep Apnoea (OSA).

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Dr Ker Liang
ENT Surgeon

MBBS (S’pore), MRCS (Edin),

Specialising in the diagnosis and treatment of a wide range of conditions affecting the

ENT system, our doctor brings expertise, compassion, and a personalised approach to

every patient interaction. From common concerns such as allergies and sinus issues to

more complex conditions like hearing loss and throat disorders, our ENT specialist is

equipped to address your unique health needs with skill. 

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