Which of the following factors are often required to be proved for compensatory damages?

Compensatory damages are awarded to compensate a plaintiff for losses suffered due to another party’s actions. To establish a claim for these damages, it's often necessary to provide evidence of both past and future medical expenses. The rationale behind this requirement is that a plaintiff may incur medical costs not only for injuries already sustained but also for ongoing or anticipated future treatment related to those injuries.

Proving future medical expenses allows the court to take into account the long-term impact of the injury, which is essential for ensuring that the victim is fully compensated for their plight. This approach is grounded in the principle of making the injured party "whole" by quantifying all losses, both present and anticipated.

While other factors like future pain and suffering and economic losses can also play roles in different contexts of compensatory damages, the requirement to present both past and future medical expenses is a specific and critical aspect that strong substantiates the claim for full compensation.