Hi and welcome to Healthcaremagic. Thank you for your query. I am Dr. Rommstein, I understand your concerns and I will try to help you as much as I can.
Trigger finger may or may not be consequance of RA. Usually this is late sign of RA so it rarely begins with this.
YOu should try with nonsteroid painkillers such as ibuprofenum or Ketorlac first.
Strapping your affected finger or thumb to a plastic
splint can ease your symptoms by stopping your finger moving. If your finger is particularly stiff in the morning, it may help to use a splint overnight.
Corticosteroids are thought to work by reducing swelling of the tendon, allowing the tendon to move freely again. This can sometimes happen within a few days of having the injection, but it usually takes a few weeks.
Sirgery is the last option and may be recommended if the above treatments don't work or are unsuitable
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Kindly regards. Wish you a good health.