Suffering occurs when we expect, or desire, our circumstances to be different than they are. Do you agree or disagree?
Note, I think there is a distinction to be made between pain and suffering. One might not have any expectations about the state of their appendix, but if it were to rupture one would still find themselves in pain. The suffering would occur because you don’t expect to be in pain.
To illustrate the difference, imagine you have a headache. Now imagine you have a headache that lasts for 10 or 20 years, or maybe even longer. At some point, you would likely become accustomed to the headache. At that point, the headache would be expected, and while it might still hurt, you would no longer be suffering, or at the very least, you would be suffering to a lesser degree.