Low levels of the sunshine vitamin, vitamin D, may contribute to chronic pain among women, scientists believe.

Pain 'linked with low vitamin D'
Article on the BBC News website (UK)

Reducing intake of salt/sodium also reduces chronic pain associated with being overweight.

Lose weight, reduce your risk of most cancers, high blood pressure, type 2 diabetes, stroke, heart disease, angina, vascular dementia, osteopenia, osteoporosis, hypercholesterolaemia, depression, liver and kidney problems, and improve your health in many other ways without drugs or expense by eating less salt! - Try it! - You will feel so much better!

See Sodium in foods