- RSI Stage 1 (mild). Pain, aching and tiredness of the wrists, arms, shoulders, neck or legs during work, which improves overnight. This stage may last weeks or months, but is reversible.
- RSI Stage 2 (moderate). Recurrent pain, aching and tiredness occur earlier in the working day, persist at night and may disturb sleep. Physical signs may be visible, such as swelling of the tendon areas. This stage may last several months.
- RSI Stage 3 (severe). Pain, aching, weakness and fatigue are experienced even when person is resting completely. Sleep is often disturbed and the sufferer may be unable to carry out even light tasks at home or work. This stage may last for months or years. Sometimes it is irreversible and the person never gets back full use of the affected part of their body.
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