Trigger finger is a common hand disorder in which swelling of the affected flexor-tendon results in triggering, locking or pain at the A1-pulley and impaired function of the finger. In this clinical lesson we describe 4 cases of patients with this condition, illustrating the clinical picture of trigger finger and how decisions regarding treatment are made. In typical cases the diagnosis is straight forward, but if the clinical presentation is less clear (e.g. in case if there is only pain at the A1-pully or a locked finger) making the diagnosis can be challenging. Conservative (doing nothing, orthosis, injection) and operative treatment options are discussed. Guiding principles are formulated which may help in choosing the most appropriate treatment for individual patients.