Nope; it's a response to a stimulus with numerous psychosocial aspects.

Choose a stimulus, say, insert a specific size needle a specific distance into a specific part of the body. If you do that with 10 people, and ask them to measure the amount of pain they experience, you will get a range of answers.

More importantly, if you do the same "test" on the same person, say, twice a day for a week, you'll also get a range of answers. How we perceive a stimulus is influenced by many variables which can change day to day, or even hour to hour.