Concussions and Suicide Risk: the Number We Don't Talk About

If you are in crisis right now, please stop reading and reach out. Call or text 988, the Suicide and Crisis Lifeline, any hour of any day. You can also text HOME to 741741. There is no bravery in going through the darkest hours alone, and the people on the other end of those lines are trained, calm, and ready. This article exists because a hard truth deserves a soft place to land, and because understanding what may be happening in your body can be its own kind of relief.

So let us talk about the number we tend to avoid. Researchers have found elevated odds of death by suicide among people with a history of a concussion (Erlangsen et al., 2018, JAMA). That sentence is heavy, and it is meant to be handled with care, not fear. It does not mean an old hit is a sentence. It means an old hit can leave a mark on mood that standard care sometimes never thinks to look for. When you understand why, the story shifts from something that happens to you toward something you can actually bring to a clinician and examine.

The hit you forgot about may not have forgotten you

Maybe it was a football game two decades ago. A car accident. A fall off a ladder, a blast overseas, a fight that ended badly. You got your bell rung, you shook it off, and life moved on. The problem is that the effects of that moment do not always keep the same timeline you do. People who have taken a bell-ringing hit are more than three times as likely to experience depression, and that elevated risk can persist for years (Beaton et al., 2020, Frontiers in Neurology). The depression can arrive so long after the impact that no one, not you and not your doctor, connects the two.

This is where the phrase concussion suicide risk stops being an abstract statistic and starts being a practical clue. When mood problems trace back to an old head injury, they may be running on a different biological system than the depression most treatments are designed for. And that changes what actually helps.

Why the usual treatments can miss it

Most antidepressants work on serotonin. That is a good fit for a great many people. But depression that follows a head impact does not always play by those rules. A meta-analysis found that antidepressants given after a head impact showed no significant difference from placebo (Foreman et al., 2019, J Head Trauma Rehabil). Read that slowly. It does not mean you did anything wrong, or that you did not try hard enough. It may mean the tool did not match the lock.

Part of why this kind of depression is so stubborn is that a single hit can ripple through several systems at once. It helps to know the company that low mood sometimes keeps:

• Sleep that never fully repaired. Sleep disorders affect roughly 30 to 70 percent of people with a head-injury history, and poor sleep feeds low mood in a loop.
• A quiet hormone shift. Up to about 1 in 6 people develop a hormone deficiency after a hit (pooled prevalence near 16.8 percent), which can look and feel exactly like depression or fatigue.
• A slow return to baseline. Roughly half of people who took a bell-ringing hit are not back to their old selves years later (TRACK-TBI, 5-year outcomes), which is a startling number of people quietly assuming this is just who they are now.

None of these show up on a routine mental health visit unless someone knows to ask. That is the gap. The symptoms get treated as ordinary depression, the ordinary treatment underperforms, and the person is left believing they are treatment-resistant when the real issue is that the map was never drawn to include an old head injury.

A different system, a different door

Here is the part that carries genuine hope. Depression tied to an old hit may run more on glutamate than on serotonin, and there is a class of treatment that works there instead. Ketamine and esketamine act on the glutamate system, with effects that can be measured in hours rather than weeks, opening a roughly 24 to 72 hour window of heightened neuroplasticity (Zanos and Gould, 2018, Molecular Psychiatry). That is a fundamentally different mechanism from the serotonin medications that may have already been tried and set aside.

An old head injury is a risk factor for depression that resists standard care. It is not, by itself, a reason to reach for any single treatment. It is a reason to look more carefully at why the standard path has not worked.

To be precise, because precision matters here: Spravato, the esketamine treatment, is FDA-approved for treatment-resistant depression. It is not approved for concussions or for any head injury, and it does not undo an old hit. A history of getting your bell rung is a clue about which kind of depression you may be facing, nothing more and nothing less. But that clue can be the difference between years of trial and error and a plan that finally fits.

What a careful look actually involves

The reason all of this matters is that the connection between an old hit and today's low mood is exactly the kind of thing a general checkup is not built to catch. It takes someone asking the right questions and knowing where to look. This is why having neurology on staff is a diagnostic advantage, a way to examine whether an old head injury is part of the picture, rather than a promise of any particular outcome. Depression is measured with the PHQ-9 at every visit so that change, if it comes, is tracked honestly rather than guessed at.

If any of this feels familiar, if you took a hit years ago and have quietly wondered why nothing seems to touch the heaviness since, you are not imagining the pattern. A proper evaluation from a clinic that has neurology on staff can look at this with you, connect the history to the symptoms, and tell you plainly whether an old injury belongs in the conversation. And whatever else is true today, that 988 line is always open, and reaching out is a strength, not a surrender.