Effectiveness of Self-administered Acupressure Intervention in Managing Constipation of Adult Psychiatric Out-patient

Patients will receive three 1-hour sessions of training at home within 3 days by Community Psychiatric Nurse (CPN), who was trained by an experienced TCM practitioner. They will learn acupressure. After the training, they will be assessed by the CPN to ensure that they are able to identify the acupoint based on reports of a sensation of obtaining 'Qi' when using the Point Locator device. They will then apply constant pressure for approximately 1 minute on each acupoint using the Acupen, as indicated by a marking in red by themselves. To ensure treatment compliance, the participants will apply this intervention once per day for 10 days. During the 10-day intervention period, and the patient should sign in on WhatsApp every day. If the patient is unable to use WhatsApp, the print edition of diary will be provided and supervision will be performed by short message and home visit during the 1st day, 5th day and 10th day of the intervention period.