Digestive tract disorders are considered as one of the most fatal human diseases. There exist several medical treatment methods that enable timely diagnosis of these diseases, among them the video capsule endoscopy is the new invented one. In this procedure, a device similar to a vitamin pill is swallowed and takes images during its passage. The images will be sent to a computer system and can be observed. The driving agent is based on the natural movements of the digestive tract movements, called peristaltic movements. This type of video capsules is called passive video capsule. In this paper some passive video capsules, along with the clinical tests performed by them, are introduced. The aim of this review is to evaluate the performance of passive video capsule in detecting digestive tract diseases. تفاصيل المقالة