Why does Humid weather increase fatigue and exacerbate joint and/or bone pain?

Thank you se7en2t and badegg for your answers!

It is the pressure changes within the atmosphere (highs and lows) that affect the pressures within the joints. If you have a sensitive knee due to injury (like I do for example), the synovial fluid pressure is is more easily affected by outside pressures which causes it to accumulate around the joints as a protective mechanism. I can usually tell when it is going to rain 2-4 days in advance by the soreness of my knee.

When the rain finally comes, the pressure is relieved and my knee is back to normal within a few days.

Humid weather makes your body work harder to cool. When a person has fatigue to begin with, this just exacerbates the condtion. You did not ask about cold weather but it works in the same way.

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