The biceps is one of the most important muscles of the flexor compartment of the arm. Recently there has been an increase in the global reported incidence of biceps tendon rupture worldwide. Generally, tears are seen in the elderly population and are precipitated due to underlying risk factors. Diagnosis is done with a combination of clinical findings and ultrasonography. We report a case of a 60-year-old female without any underlying risk factors who presented with nontraumatic spontaneous rupture of the right biceps tendon.  Kulcsszavak: biceps, rupture, ultrasonography, Popeye sign