As a doctor, that is a great way to report pain. Most of the time we’re asking for ballpark and trend reasons though. If I come and it’s a 3 first time, then a 5, then a 7, that’s good and I can do something about that. If it’s a 8-9 and the patient is in their phone, and it stays 8-9, well the absolute magnitude may be less of a concern to me.
Regardless, if someone comes in and reports high pain I am going to administer strong painkillers (I work in emergency departments)