Which symptom might indicate a problem for Daisha while working as a cashier?

Loss of strength in the thumbs is particularly relevant for Daisha's role as a cashier, as this job often involves repetitive hand motions, such as scanning items, handling money, and using a cash register. Over time, these repetitive tasks can lead to conditions such as carpal tunnel syndrome or tendinitis, which affect the strength and functionality of the thumbs. If Daisha experiences a loss of strength, it may hinder her ability to perform these essential tasks effectively and could indicate the onset of an ergonomic-related injury.

The other symptoms—loss of sensation in the toes, severe pain in the back, and numbness in the legs—may also reflect ergonomic or health issues, but they are less specific to the activities and physical demands associated with being a cashier. Such symptoms might suggest problems related to other aspects of physical health or workplace ergonomics, but they do not directly correlate with the typical movements and postures that cashiers engage in while performing their duties.