Yit Shiang was previously a consultation-liaison psychiatrist with the department of psychological medicine in NUH with a clinical focus in transplant psychiatry and addiction medicine, particularly dual disorders within the medical and surgical disciplines in the hospital. He led the psychiatric ward in NUH and developed the addiction clinic in addition to his role as patient safety officer. He partnered with pain anaesthetists and palliative care specialists to enhance mental health care for their patients.

He was appointed as an assessor for Vulnerable Adults by Ministry of Social and Family Development (MSF). He was also a sub-committee member in the workgroup contributing to the Opioid Prescribing Guidelines released by Ministry of Health (MOH) recently.

In addition to providing clinical service, Yit Shiang has been actively involved in medical education including curriculum development, lecturing, mentoring, assessing and training nursing and medical students in NUS. He was awarded teaching excellence awards and this passion in medical teaching led him to attain a Certificate in Medical Education from the Medical Education Unit in 2014. He examines for NUS Medicine, NUS Master of Nursing and RC Psych. He volunteers for Project Sa'Bai and NUS Medicine Admission Exercise.

Yit Shiang has also researched on the attitudes and perceptions of healthcare workers towards their patients with alcohol use problem and is interested in teaching them screening and brief interventions for patients with substance use. His graduating thesis was on Very Brief Advice in Smoking Cessation. He had published on several topics in mental health and addiction, and authored articles on alcohol and gambling in the media.

Yit Shiang left public service to set aside time to contribute to disability medicine in the community while embarking on private practice. He is currently a locum specialist with MINDS Developmental Disability Medicine Clinic. He has an outpatient service at Katong i12 Core Clinic.