Low mood after a head injury tends to get explained away twice. First it reads as a fair response to a hard stretch of life, which it partly is. Then it reads as something that will lift once the headaches and the dizziness settle, which often it does not. Both explanations hold enough truth to delay the one step that usually helps, which is treating the mood as a problem of its own with a plan of its own.
The association between head injury and depression is well recognized in clinical practice. People who have had a concussion, a fall from height, a blast exposure, or a wreck on a Missouri highway describe low mood more often than people who have not. The association also runs in an uncomfortable direction. When depression shows up in someone with an injury behind them, it is more often the kind that does not clear on the first antidepressant, or the second. That is a reason to plan carefully, not a reason to expect the worst.
Why the two problems get tangled
Put a list of symptoms that follow a concussion next to a list of symptoms that define depression and the overlap is immediate. Both lists name the same items: sleep that breaks up, attention that will not hold, thinking that has slowed, a short temper, tiredness that rest does not answer, and a dulled pull toward whatever used to matter. A clinician looking at either list can plausibly assign everything to the other one.
The tangle gets tighter because of what an injury takes with it. Pain that does not let up. A job that had to change, or a sport that ended. Months of appointments. Being told you look fine. Noise and light that have become hard to sit with, which quietly shrinks the part of life that involves other people. None of that is imaginary, and none of it is separate from mood.
Leaving the two blurred together has a practical cost. If everything is filed under the injury, nobody treats the depression. If everything is filed under depression, nobody looks at sleep apnea, a thyroid level, a vestibular problem, a medication that is flattening you, or the alcohol that crept in to make evenings survivable. The workable approach is to name both and work on both.
What an injury history should change about the plan
Say the injury out loud at the appointment, even if it was years ago, even if nobody used the word concussion at the time. Bring the date, what you were doing, whether you lost consciousness, how long you felt off afterward, and what was different about you in the months that followed. A short written timeline beats a careful verbal account, because it survives a fifteen minute visit.
Expect a wider workup than a standard mood appointment. Sleep deserves a real look, including snoring and any witnessed pauses in breathing, because untreated sleep-disordered breathing makes every mood treatment work harder. Headache pattern, balance, vision, and neck pain belong in the notes. So does a frank list of everything you take, prescribed or not, since some medications used after an injury carry sedation or mood effects of their own.
Expect the pacing to be different too. People with an injury history often feel side effects earlier and more sharply, so a thoughtful prescriber may start low and move slowly, and should tell you that is the plan rather than leaving you to wonder. Ask what the target dose is and when the two of you will look at the results. A trial with no review date tends to quietly become a year.
Track function alongside feeling. Hours slept, how many days you left the house, whether you could finish a page of reading, whether you snapped at people you love. Mood ratings drift and blur together. Those details do not, and they are what tells you whether a treatment is doing anything at all.
Where newer options enter the conversation
Once two solid antidepressant trials sit behind you with little to show, the conversation should widen into a second tier: a companion medication picked for a different mechanism, structured therapy built around the single loudest complaint, transcranial magnetic stimulation, ketamine delivered during a supervised clinic visit, or Spravato under its REMS program. What puts those on the table is how the depression itself has behaved over months, not the presence of an injury in your past. A knock to the head earlier in life does make the stubborn version of depression more likely, and for that reason it belongs in how your case gets explained. What it is not is a reason to pick one particular treatment, and any practice acting as though it were has gone well past what the evidence will carry.
A reasonable consultation is slower than that. A clinic that regularly sees patients whose trouble dates from a wreck or a blow to the head will ask for the timeline, the record of what has already been tried, and your other diagnoses before any talk of treatment, and one Missouri group builds its intake around the question of what changed since the accident. Hold every clinic you call to that standard. If nobody asks what you have already tried, you are not being assessed.
None of this is a promise about how you will end up. It is a way to stop losing years in the gap between two specialties, each of which assumes the other is handling your mood. Should the idea of ending your life start showing up, treat it as the one item that comes before everything here: 988 answers a call or a text around the clock, and an emergency department will take you without an appointment. Short of that, the next move is small and real: one page of history, one appointment, and one direct question about what comes after the medication that did not work.