Capillary rheometry was used to analyze the variations in end correction as a function of shear rate and temperature in various thermoplastics. For PP, HDPE, LDPE, and PS the end correction increases as shear rate increases, up to a certain point, beyond which the effect is reversed, i.e., the end correction decreases. These variations in the end correction have been attributed to the occurrence of incipient solidification of the flowing material, either because conditions are near those necessary for flow‐induced crystallization, as in PP, HDPE, and LDPE, or because conditions are near those necessary for the transition to the glassy state, as in PS.