When people picture depression treatment, they usually picture an antidepressant, a medication that nudges serotonin. For many people that helps, and it is a reasonable place to start. But a meaningful number of people cycle through one medication after another and still feel the same heaviness, and for them the serotonin story is only part of the picture.
At Sphosh Health, when depression doesn't lift the way it should, we widen the lens. Depression is not one thing with one cause; it is a final common pathway that many different problems can lead to. Here is what is worth looking at when the standard approach falls short.
The limits of the serotonin story
The idea that depression is simply "low serotonin" is a useful simplification, not the whole truth. Antidepressants can genuinely help, but the underlying biology of low mood involves inflammation, stress hormones, sleep, blood sugar, thyroid, nutrition and life circumstances, not one chemical. That is why raising serotonin alone sometimes isn't enough: it doesn't touch the actual driver.
What else can drive depression
Thyroid and hormones
An underactive thyroid is a well-known cause of low mood, fatigue and slowed thinking that can look exactly like depression. Hormonal shifts, postpartum, perimenopause, and others, can do the same. These are checkable.
Inflammation
There is a growing body of research connecting chronic, low-grade inflammation to depression, particularly the kind of depression that feels physical: heavy, exhausted, unmotivated. Where inflammation is part of the picture, addressing its sources can matter as much as any medication.
Sleep
Depression disrupts sleep, and poor sleep deepens depression. Untreated sleep problems, including sleep apnea, can hold low mood in place no matter what else is tried. Sleep is often the highest-yield place to start.
Nutrition and blood sugar
Deficiencies in nutrients like vitamin D, B12, folate and omega-3s are linked to low mood, and blood-sugar swings can drive the irritability and crashes that feed a depressed state. We look at the gut-brain connection here too, since gut health shapes mood more than most people expect.
Life, meaning and circumstance
Not all depression is biological. Grief, isolation, burnout, and a life that has drifted away from what matters to a person are real causes, and no medication fixes them. Naming this honestly is part of good care, not a failure of it.
What "looking beyond serotonin" means in practice
It does not mean rejecting medication. It means not stopping at medication. A root-cause approach to depression usually involves:
- A thorough evaluation that maps the timeline, the physical symptoms, and what has and hasn't helped, our psychiatric evaluation is built for this.
- Targeted testing where the story points, thyroid, nutrients, inflammation, and other contributors, through functional medicine testing.
- Treating the foundations, sleep, nutrition, movement and stress, which change the biology of mood, not just the symptoms.
- Medication used thoughtfully where it genuinely helps, as one tool among several rather than the only one.
Why this matters
People who have "failed" several antidepressants often conclude the problem is them. Usually it isn't, it is that the actual driver was never addressed. Finding and treating that driver is what turns partial improvement into feeling like yourself again. If your depression hasn't lifted despite a fair effort, a wider workup with a root-cause approach to depression may be worth exploring.
This article is for general education and is not medical advice. Never stop or change a psychiatric medication without guidance from your prescriber. If you are struggling with thoughts of suicide or self-harm, call or text 988 (Suicide & Crisis Lifeline), support is available right now.