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Grinding sound from joints (medically known as CREPITUS) , along with symptoms of pain may indicated inflammation of joints like- osteoarthris, rheumatoid arthris, or fracture
may be. But if there is no pain or any other symtpom, it may be harmless and may go away by itself.
Sometimes when you begin workout in the moring, these sound are heard, initially, and subside as you go on exercising.