The fact is, not treating pain can make things worse. Less pain means less stress on the body and the mind, so healing occurs faster. If your child hurts less, he will be able to get up and move around sooner after the surgery. You want that to happen because it reduces the risk of post-op complications, such as pneumonia, infections, fever, and blood clots.
Taking pain meds for several days won’t make your seven year-old a prescription-drug junkie. If your child needs to take pain meds or sedatives for a longer period, your doctor will decrease the dose slowly to prevent any withdrawal symptoms.
From The Smart Parent's Guide: Getting Your Kids Through Checkups, Illnesses, and Accidents by Jennifer Trachtenberg.

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The Smart Parent's Guide: Getting Your Kids Through Checkups, Illnesses, and Accidents
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.