Inflammation of the flexor digitorum tendon, often associated with the Kanavel signs: (i) finger held in slight flexion, (ii) fusiform swelling, (iii) tenderness along the flexor tendon sheath, and (iv) pain with passive extension of the digit. The phenotype is Digital flexor tenosynovitis (HP_0012276, a Human Phenotype Ontology term). Also known as: Trigger finger.