De Quervain’s Tendonitis (also known as ‘first dorsal compartment tendonitis’) is characterised by pain at the base of the thumb and the thumb side of the wrist. The pain is usually brought about by thumb and wrist movement, especially grasping or holding an object and making a fist.
The symptoms may progress gradually or acutely and may radiate down the thumb or up the forearm. The cause is irritation of tendons to the thumb as they pass across the wrist (the so called first dorsal extensor compartment of the wrist).