This is often an inflammation of your tendons about the thumb aspect on the wrist, causing pain in the course of thumb movements or when gripping. Swelling to the thumb side of the wrist: Swelling could possibly be visible close to the wrist joint, occasionally accompanied by fluid-crammed cysts at https://www.theorthopaedicandpainpractice.com/why-does-the-side-of-my-wrist-hurt/