When a smiling and cooperative patient complains of discomfort, nurses caring for this patient often harbor misconceptions about the patient's pain. Which of the following is true?

A. "The PCA will give additional pain medication whenever the button is pushed." PCA pumps have lockout intervals to prevent overdose, so pushing the button repeatedly will not always result in additional medication.
B. "Wait until the pain becomes severe before pushing the PCA button." PCA is most effective when used at the onset of pain rather than waiting until it becomes severe, which can make pain harder to control.
C. "The PCA will deliver medication through the IV until the pain is all gone." PCA provides controlled doses of medication but does not eliminate pain entirely. The goal is pain management, not complete pain relief.
D. "You or a designated family member are the only one who gets to push the PCA button—nobody else may do so." PCA is designed for patient-controlled use, and only the patient (or a designated, trained family member in special cases) should operate it to ensure proper dosing and safety.

A. Due to a specific stimulus. Pain can occur with or without an identifiable stimulus. Conditions like neuropathic pain or phantom limb pain exist without an obvious external cause.
B. Caused by a single physiological situation. Pain can result from multiple factors, including tissue damage, nerve dysfunction, inflammation, and psychological influences. It is not limited to one specific physiological cause.
C. Universally the same for everyone. Pain perception varies widely between individuals due to differences in pain tolerance, cultural background, past experiences, and psychological state.
D. Subjective. Pain is defined as whatever the patient says it is, making it a subjective experience. It cannot be measured objectively, and the best indicator of pain is the patient’s self-report.