Our expert says:
You ask what causes a weak body with knees and all joints very weak. I am afraid that without more information I can’t possibly tell you! There are many causes of weakness, a term usually applied to muscle strength. Joints themselves do not become weak; it is the muscles that move the joints that may become weak.
A feeling of generalized weakness may be caused by a host of conditions, too numerous to mention. My advice would be to go and see a good general practitioner and discuss the problem with him or her.
Best wishes, JT.
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