How depression is different from sadness
By Dan Kauna, July 16, 2026Many people have heard the phrase “amka upambane” when going through a rough patch. While well-meaning, this advice often confuses ordinary sadness with clinical depression.
Sadness is a normal reaction to life’s disappointments, like losing a job or a relationship. It passes with time, distraction, or a good chat with a friend. Depression is entirely different; it is a physical brain condition that you cannot simply think your way out of.
What stress does to your brain
To understand depression, we must look at how the brain handles prolonged stress. When you are stressed, your body activates a pathway called the HPA axis, releasing a hormone called cortisol. In a healthy brain, this system shuts off once the stressor is gone. In a depressed brain, the switch gets stuck, leaving the brain flooded with cortisol.
This chemical overload damages the hippocampus, the brain’s centre for learning and memory. Peer-reviewed research shows that “decreased neurogenesis has been implicated in the pathogenesis of anxiety and depression.”
In other words, chronic stress physically stops the brain from growing new cells in areas that regulate mood. This is not a lack of willpower; it is a structural injury.
When the brain blocks joy
Depression also changes how the brain processes joy. Usually, when something good happens, your brain releases dopamine, the chemical that makes you feel rewarded.
In clinical depression, this pathway is blunted. Even if something wonderful happens, the brain cannot register the pleasure. Scientists call this anhedonia, and it explains why a depressed person cannot just cheer up.
At the same time, the brain’s default mode network, which handles self-reflection, becomes overactive. This locks the person in a painful, repetitive loop of negative self-criticism.