The main plot had to do with Gary Corrigan and his health. Maggie became closer to the young man, which frustrated his Aunt Phyllis. It was completely innocent, but Phyllis seemingly cared more about her family's steel company than anything else. Gary loved sculpting, and feels he has to give up that dream. Nick was brought onto the case due to Gary having mood swings. He realized that Gary's emotional outbursts weren't psychological, but neurological. Gary was in the military and during a training exercise had a serious concussion after falling out of a plane at the wrong angle. He was given a medical discharge, due to the injury. The car accident damaged his brain again. Many tests were given, and Nick was proven correct. Before surgery, Phyllis wanted Gary to do a will, but approached it in the wrong way. Matt banned her from her nephew's hospital room due to her behavior. Liz helped Nick out in the lab and with Gary.
Anna also had major health issues and was admitted to Hope Memorial. Althea felt she needed surgery. Steve felt the opposite and Matt agreed to wait and see. Anna was relieved that it was just gastritis and not a perforated ulcer, so she would be just fine. Before hearing the news, she had a nightmare where Matt was attacking her with a scalpel. Considering what Anna went through as a paralyzed person, it is understandable why she wouldn't want to go through surgery again. Steve and Althea are no longer dating to the relief of many viewers. Carolee and Dr. Allison got along together and Steve seemed jealous. Mike and Julie were sidelined for the most part.
Those were the highlights of March 1970. Due to how much time was taken with Gary there wasn't much happening in the personal lives of the regular characters at Hope Memorial.