Trigger Finger is a common hand condition that causes the fingers or thumb to be hard to move and straighten. Fingers can freeze in a bent position due to the tendons in the hand becoming swollen. This makes straightening of the digits (fingers/thumb) difficult, most commonly the ring finger.
Trigger Finger is most common in people of age 40-60 and conditions such as arthritis and diabetes can increase the risk of experiencing Trigger Finger. 
Symptoms of Trigger Finger include:

• A snapping sensation when the fingers are moved

• Pain and stiffness

• Soreness at the base of the fingers

• Swelling in the palm

• Digits locking in flexed position

These symptoms are usually at their worst in the morning as digits are not in use whilst asleep. However, there are several treatments to ease symptoms and prevent then from worsening. 
The treatment depends on the severity of the Trigger Finger. If the condition is mild treatment may include rest, splints to stretch the digit, exercises or anti-inflammatory drugs (e.g., Ibuprofen).
Surgery may be required for severe cases and is known as a Trigger Finger release procedure. A small cut will be made in the tunnel of tissue surrounding the tendons giving the tendons more space to move. The surgery is an outpatient procedure and recovery can be a few weeks until the thumbs/fingers can be used normally.