Pain is wherever the patient says it is.
No, I have not experienced the excruciating pain of a horntail wasp sting.
No, I have not experienced the excruciating pain of a parasitic wasp sting.
No, I have not experienced the excruciating pain of a gimpy gimpy plant sting.
I experienced a lot of pain after the surgery.
No, I have not experienced the intense pain and burning sensation of bear mace to the face.
"Have you had any recent shoulder pain or gas?"
It's spelled Pain. It comes from the English word Pain, because Nagato has experienced pain in his life, that's how he chose to call himself.
Persistent pain in the stump or pain in the phantom limb is experienced by most amputees to some degree. Treatment of phantom limb pain is difficult.
The "payout" is commensurate to the amount of pain and suffering you actually experienced. Stress is not recoverable.
Have you ever felt pain or discomfort between your toes?
"Have you felt any gas-related pain in your shoulder lately?"
"Have you had bladder pain and seen blood in your urine lately?"