Hello Amween ,
Trigger thumb occurs due to degeneration of the tendon of the thumb and prevents its smooth movement in its covering (sheath). It develops more frequently in individuals with diabetes, thyroid disorders and in patients with osteoarthritis. This may also be associated with inflammatory arthritis, gout, or chronic infection. Treatment entails;
1) oral nonsteroidal anti-inflammatory drugs,like Ibuprofen.
2) steroid injection, and
3) splint that prevents motion of the joints of the thumb.
The prognosis is very good and it resolves with the thumb splint and Ibuprofen in around 10 days.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.