Many conditions are reported either to be associated with fibromyalgia or to share similar symptoms. Because there are so many other conditions with similar symptoms, diagnosing fibromyalgia can be difficult.¹ Some of these disorders include:

• Chronic fatigue syndrome.
• Depression.
• Osteoarthritis.
• Restless legs syndrome.
• Rheumatoid arthritis.
• Polymyalgia rheumatica (PMR).
• Lupus.
• Lyme disease. Some people report having had Lyme disease prior to a diagnosis of fibromyalgia, but a connection between the two conditions has not been established.
• Hypothyroidism (low thyroid level).
• Sleep apnea.
• Temporomandibular disorder (jaw problems).
• Irritable bowel syndrome.
• Interstitial cystitis.