Let’s imagine that one person is forced to go on medication that puts them in serious pain.  Another person cuts them self.  The former will be fighting tooth and nail to get off said medication.  Doctors won’t listen to him.  The latter will be hospitalized and everything possible will be done to prevent his self harm.

Both these examples involve pain but the person cutting them selves is bringing on pain in a way that isn’t socially acceptable to those in power.  The kind of pain that is treated is the kind that one has power over (and consequently those in power aren’t comfortable with).  If doctors truly cared about pain the person cutting them self and the person in pain caused by their medication would be treated with the same urgency.