Hi thanks for your query and welcome to lybrate. I am Dr. Akshay from fortis hospital, new delhi. De quervain's tenosynovitis is inflammation of sheath of 1st extensor tendons due to which there is pain at the level of styloid process. The treatment depends upon the symptoms you are having, normally ice packs for local application, thumb spica splint for 3-4 weeks not only at night but all throughout, anti-inflammatory medication as per your suitability, local analgesic spray for application but no massage, ultrasonics and laser as physical therapy modalities are useful in many cases.
But if it does not get better, then release is better, it is actually a daycare procedure which take about 8-10 minutes to do in ot under local anesthesia, so it is very safe procedure. Do not hesitate to contact me if you need any further assistance.