What is the range of damages for injuries sustained by a plaintiff as a result of the tortfeasor's negligence?

As the court said in Blackwater, a plaintiff is only to be restored to his original position, and not a better position. A defendant is not required to compensate a plaintiff for any debilitating effects arising from a pre-existing condition that the plaintiff would have experienced anyway, and if there is a measureable risk that the pre-existing condition would have detrimentally affected the plaintiff in the future, regardless of the defendant’s negligence, this is to be taken into account in reducing the overall award: Athey, at para. 35; Moore v. Kyba, 2012 BCCA 361 at para. 43. In addition, damages caused by other non-tortious causes that occur after the defendant’s wrongful act must be taken into account: Blackwater, at para. 80. This is referred to as the “crumbling skull” doctrine. It is important to note that any reduction made to take these factors into account does not reduce the damages; it simply awards the damages which the law allows: see Blackwater, at para. 84.