There could not be enough patients recruited

Fibromyalgia is a common chronic pain syndrome characterized by bad treatable chronic widespread pain present at a similar level for at least 3 months. The aim of this study is to examine if 3 weeks of transcranial direct current stimulation is a suitable therapy to reduce chronic pain.

Inclusion Criteria:

• Patients who have an established diagnosis of fibromyalgia according to the 1990 criteria of the "American College of Rheumatology"
• Symptoms have been present at a similar level for at least 3 months
• Stable medication for at least 2 months
• visual analog scale ≥ 3 (0=no pain; 10=worst possible pain)
• The patient does not have a disorder that would otherwise explain the pain

Exclusion Criteria:

• Alcohol/substance abuse
• Pregnancy
• Neuropsychiatric disorders
• Metal implants near stimulation area
• Cardiac pace maker
• Local injuries
• Inflammatory rheumatic disease
• Acute tumor
• Acute fracture
• Well-defined neuropathic induced pain