Initial pneumonitis was diagnosed with an acute cough I started having. I was fatigue as well but attributed that to chemo since I was on kadcyla. It’s know unfortunately that kadcyla can cause pneumonitis when combined with radiation in about 2% of people. Unfortunately I happened to be in the 2%. Subsequent pneumonia would be triggered by sickness. Never had issues before my breast cancer diagnosis. I was healthy, exercise daily and keep up with regular exams.