Rule out medically, first

Physical and pharmacological causes are worth excluding: **emotional blunting is a known side effect of SSRI antidepressants** — if it started after beginning or increasing a dose, that is a legitimate reason to discuss adjustment with your doctor rather than endure it silently. Likewise, hypothyroidism, severe anaemia, B12 deficiency and exhaustion from chronic sleep deprivation produce a flattening easily mistaken for the psychological kind.

What is actually happening

Numbness is a form of protection. When emotional intensity exceeds what can be processed — abruptly, in trauma, or slowly, under prolonged stress — the system reduces the amplitude. Not selectively: everything dims, joy included.

Hence the part that frightens people most: they describe watching their own life through glass. They know they should feel something at good news and don't. And the absence of a reaction produces guilt — the one emotion that still gets through.

What matters is that it isn't permanent and isn't a change of character. It is a raised threshold, and it comes back down when the load drops or when it is worked on directly.

What it could be

Several possibilities, because this list is not a diagnosis. What separates them is in the detail below each.

Depression
How to tell
The numbness comes with anhedonia and fatigue, settled in gradually over weeks, and is present regardless of context. In severe depression it replaces sadness entirely — patients say “I wish I could cry”.
Dissociation
How to tell
It comes in episodes rather than constantly, and is accompanied by a sense of unreality — you watch yourself from outside, the world looks flat. Often triggered by stress or by a context that resembles something.
Advanced burnout
How to tell
The cynicism component of burnout looks exactly like numbness but is context-bound — you feel empty at work and more alive at the weekend or with friends. If that difference exists, it is burnout rather than depression.
Alexithymia
How to tell
It isn't a change — it has always been this way. The emotions exist but have no names: you feel them as tension or heaviness in the body without being able to translate them. Stable over time, unlike everything else here.

What helps now

Start from the body, not the emotion. The question "what do I feel?" has no available answer. "Where do I feel something in my body right now, and what is it like — tight, heavy, hollow?" does. That is the route therapy uses in exactly this situation.

Don't force the emotion. Trying to feel frequently produces more numbness, plus guilt at the failure.

Movement and intense physical sensation. Cold water, a short burst of effort, cold air. It doesn't address the cause, but these are among the few things that cross the threshold and remind the system it can feel.

Check the medication. If it began after an antidepressant, tell your doctor. It is adjustable, and a frequent, under-reported reason people abandon treatment.

Social contact, even without the appetite for it. Numbness produces isolation, and isolation deepens it. Deep conversation isn't required — presence is enough at first.

When to get help

Book an assessment if it has lasted more than two weeks, if you can no longer function at work or at home, or if it began after a traumatic event. **Numbness is dangerous precisely because it doesn't hurt: if thoughts appear that nobody would miss you or that there's no point continuing, call 112 now.** The absence of pain does not mean the absence of risk — if anything, the reverse.