The phrase "diagnosis issues" means problems or difficulties in determining or identifying a medical or other type of condition. It refers to challenges or obstacles in correctly understanding and classifying an issue or illness. Full definition
I work with those who experience substance abuse / addictions, mental health and dual diagnosis issues. (psychologytoday.com)
There's the obvious, where a patient walks in with a list of symptoms and the physician diagnoses the issues and offers a corrective strategy — rest, medicine, surgery, etc.. (entrepreneur.com)
These include physical health, legal, occupational, and psychiatric / dual diagnosis issues. (familyfocusedsolutions.com)