There are 14 body systems recognized by the ROS. These systems are listet as follows:
1- Constitutional symptoms
2- The eyes
3- The ears, the nose, the mouth and the throat
4- The Cardiovascular system
5- The Respiratory system
6- The Gastrointestinal system
7- The Genitourinary system
8- The Musculoskeletal system
9- The Integumentary/Breast system
10- The Neurological system
11- The Psychiatric system
12- The Endocrine system
13- The Hematologic/lymphatic system
14- The Allergic/immunologic system