After using a cold pack, which response indicates the need to discontinue cryotherapy?

The development of hives after using a cold pack indicates a potential allergic reaction or hypersensitivity to the cold modality, which is a clear reason to discontinue cryotherapy. Hives, or urticaria, are raised, itchy welts on the skin that can signify an adverse reaction, and it's essential to prioritize the patient's safety above all else.

In contrast, while increased pain and complete numbness may seem concerning, they are more common responses associated with cryotherapy. Increased pain may indicate that the cold is not effective; however, it does not necessarily warrant immediate cessation of treatment unless severe. Complete numbness might occur as a temporary effect of the cold; it is essential to monitor the duration and intensity of this response closely. Improved range of motion would typically indicate that the treatment was beneficial and is not a reason to discontinue.

Therefore, the presence of hives symbolizes a significant adverse reaction necessitating the immediate cessation of cold therapy to ensure the patient's health and safety.