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Inflamatory arthritis like rheumatoid can.
There are many different forms of arthritis and what would affect some would have no affect on others.
Psoriatic arthritis should not affect your stomach. Arthritis is painful swelling of joints, and does not affect the stomach. Psoriatic arthirits is a complication of the skin disorder psoriasis, itchy, red lesions on the skin.
Rainy days can affect arthritis by causing joints to ache or even swell. Changes in temperature and air pressure often cause painful swelling in joints affected by arthritis.
As there is no such thing and the brain has no muscles in it I strongly doubt that it has any affect