Amyloidosis
Amyloidosis is a rare kind of disease that occurs due to building of an abnormal protein called amyloid in the organs, which then starts to interfere with all the normal body functions. This protein is not found in the body but can occur by several other proteins. Amyloidosis can be a cause of trigger finger as trigger finger can arise due to the presence of amyloid depositions in the tendon sheath which restricts the movement of the finger and can lead to trigger finger.