Tendonitis (sometimes caused by tennis elbow) happens when the tendon swells up and becomes painful. It is most often due to repetitive movements in the arm which cause stress and injury to the tendon.
Carpal Tunnel can causes a tingling or a numbing sensation in the fingers or hand. It is often caused by excess pressure to the wrist and to the median nerve, this causes swelling and inflammation in the wrist.
Osteoarthritis is the most common type of arthritis in the UK and often effects the fingers. It causes the fingers to become stiff, painful and swollen over time making it difficult to perform daily tasks. Osteoarthritis can also effect other areas of the body such as the hips and knees.