Which of the following is an example of a common side effect pharmacy assistants might discuss with patients?

Discussing common side effects with patients is a significant part of a pharmacy assistant's role in helping patients understand their medications better. Side effects such as headaches, nausea, or dizziness can frequently occur with various medications and are important to communicate to patients. These effects are typically mild and transient, which makes it easier for patients to manage their expectations when starting a new medication.

In comparison, the other options involve more severe or less common circumstances. Immediate hospitalization relates to critical situations that require emergency medical care and are not regular side effects that patients would typically encounter. Changes in blood type are a rare and serious medical issue that does not apply to common medication side effects. Allergic reactions to minor injuries are also not standard side effects associated with medications; while allergies can happen, they are more severe than the common side effects generally associated with pharmacy discussions. Therefore, the selection of headaches, nausea, or dizziness aligns with the common experiences that patients may have, making it the most appropriate choice for this question.