There is no difference, repetitive stress injury and repetitive strain injury are the same thing. It is some time known as RSI which is an abbreviation that works for both. It also has other names, some of which include: occupational overuse syndrome (OOS) cumulative trauma disorder (CTD) work related upper limb disorder (WRULD) and non-specific arm pain. The main reason that there is such confusion over the name is that it is not actually a specific disorder but rather an umbrella term for many localized injuries or conditions.
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