I've been so lucky to co-author some articles on this in terms of psychiatric symptoms. There's no question that concussions, especially when you're young, increase your risk of psychiatric issues later on, mental health issues. Suicide is a very complex act, but the literature is pretty clear in countries with socialized medicine. One big study and review of studies out of Canada recently showed that even with just one concussion, you have twice the risk of suicide, potentially for the rest of your life.
The two operating theories on that are, one, that it changes the way your brain functions, and two, that it impairs your life. It impairs your ability to work, your ability to do things you love, your ability to have relationships. That is a clear association in the data. The reality is that when we look at some of these stories, we're trying to piece together what's happening, trying to build a dataset from it. The issue of concussions leading to a larger risk of psychiatric symptoms, or a larger risk of suicide, is in the data.