Something I haven’t seen mentioned here is stress. Stress is highly unlikely to kill you directly, but it exacerbates ADHD traits in a negative way. It also exacerbates just about every other mental and physical condition. Living in a world not built for us is extremely stressful, it’s even worse in those of us who aren’t diagnosed or have to live with inadequate accommodations.

  In addition to stress, there is a link between ADHD and higher suicide rates. We often have comorbid conditions like depression, anxiety, complex PTSD, bipolar, and PMDD. That and, again, living in a world not built for us is extremely hard, some of us just can’t handle it.

Sources:

• https://psychcentral.com/stress/can-you-die-from-stress/
• https://www.psychologytoday.com/us/blog/the-athletes-way/201402/chronic-stress-can-damage-brain-structure-and-connectivity/
• https://www.medicalnewstoday.com/articles/adhd-suicide/
• https://www.healthline.com/health/adhd-suicide/
• https://www.additudemag.com/suicide-linked-to-adhd-more-than-depression-in-children/