High cost of illness in fibromyalgia patients in Iran, irrespective of disease severity: A prospective cost study.

Aims: This study aimed to estimate the economic burden of fibromyalgia (FM) in 6 months, using a cost-diary, and to evaluate its relationship with the disease severity.

Methods: This is a prospective cost-of-illness study on 62 participants with an FM diagnosis within a 6 month period. Patients completed the questionnaires, including FIQR (Revised Fibromyalgia Impact Questionnaire) and SF-12 (12-item short-form survey).