Fatigue severity scale
visual pain, fatigue
Krupp et al. designed the FSS in 1989 to measure fatigue in people with MS. The main fatigue intensity scale is a 9-item questionnaire, each part of which contains statements rated on a seven-point Likert scale from 1 "strongly disagree" to 7 "strongly agree". The total score of the scale is obtained from the average score of the statements and varies from 1 to 7. An average score of more than 4 is defined as fatigue. The validity of the tool showed that the FSS in patients with MS had a significant correlation with the visual pain scale (