Currently, an increase in the rate of spinal cord problems among young people and adults are due to improper sitting posture like slouching and hunching. This bad posture is due to the usage of computers, smartphones and other portable devices for long hours. In the recent years, there has been huge development in sitting posture monitoring systems to prevent the spinal and neck pain, Which are not only monitored the posture in real-time and also provide the feedback to improve their posture. The main aim of this survey paper has to provide a review of the recent advancement in the posture monitoring system. A detailed study has been carriedout about the various sensing technology used to measure the sitting and reading posture in real time and the feedback based on the measured data. This paper explores the various monitoring system classification based on the portability and ease of use of the system.