Is there a treatment for somebody who can't physically cry?

Psychotherapy, maybe: Not being able to cry in and of itself doesn't mean treatment is indicated, but it might, possibly, be a marker of other difficulties associated with the healthy expression of feelings. Consulting with a psychologist or psychiatrist could be one option to determine if treatment is necessary, and how it could help.

How do you know?: There's a difference between being unable to physically cry and not crying for psychological reasons. If there is a physical explanation for your lack of crying, an ophthalmologist could help. If you're not crying because you are unable to fully experience emotions, a mental health professional could help. In both cases there are effective treatments. A psychological explanation is more likely.