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The Wong-Baker FACES scale is designed to assess pain through the use of facial expressions that represent different levels of discomfort. This scale is particularly beneficial for patients who have difficulty with verbal communication, such as those with aphasia. Since aphasia can hinder a person's ability to express their feelings or even understand complicated language, the visual nature of the Wong-Baker FACES scale allows the patient to communicate their pain level effectively by selecting a face that corresponds to their experience of pain.

In contrast, the Numeric pain scale requires patients to verbally rate their pain on a numerical scale, which can be challenging for someone with communication difficulties. The Visual analog scale also relies on the individual's ability to understand and indicate a position on a line representing pain levels, which can be problematic for those with aphasia. The McGill Pain Questionnaire incorporates a more complex set of descriptors that would be difficult for an individual with aphasia to comprehend and utilize.

The use of the Wong-Baker FACES scale supports non-verbal communication, making it a more suitable choice for assessing pain in patients who have challenges expressing themselves verbally.