The plaintiff, Cynthia O’Neal, brought a legal malpractice claim against her former lawyers. O’Neal, an owner of a restaurant chain that fell on hard times, alleged that her former lawyers had a conflict of interest when the represented her company and the opposing party in an assumption of a lease. The court rejected her claim on the grounds that she was unable to establish proximate causation.
In my experience, proximate causation can be difficult to prove. Lawyers make mistakes. Sometimes those mistakes breach the duty of care. The plaintiff must tie the negligent act to the damages suffered by plaintiff and come up with a plausible theory as to how the lawyers made things worse and caused the damage.
One area where it is very difficult to prove proximate causation is a legal malpractice claim in the foreclosure setting. The lawyer who defends the foreclosure may miss a deadline or make a legal error. However, that lawyer did not cause the default and did not proximately cause any damages.
Chicago Legal Malpractice Lawyer Blog

