Carpal tunnel vs tendonitis: both can be the cause of similar symptoms, but these conditions are very different.
Your hand doctor may suggest a cortisone injection for quick relief of pain caused by a number of hand conditions.
Some of the symptoms of tendonitis are pain, swelling, tenderness, as well as snapping or catching when moving the affected area.
If you have a work related hand injury, you should consult with a specialist for the best possible outcome.