No one knows: This is not a consistent occurrence in patients with fibromyalgia but it is an occasional complaint. The exact cause is unknown.
Answered 12/9/2022
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Relaxin: Imo hypermobile joints, which are associated with #fibromyalgia (see british joint hypermobility syndrome studies) become even more loose during menses ; pregnancy. Reason likely an hormone called relaxin secreted at these times, causing greater laxity of ligaments. Loose joints place greater stress on tendons ; muscles, which attempt to compensate for loose ligaments. Gravity is the enemy.
Answered 7/18/2016
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