Anhedonia

Anhedonia is a marked loss of the ability to feel pleasure or enjoyment from activities that would previously have been experienced as rewarding or satisfying. Rather than simply losing interest in doing things, the person finds that even when they do engage in a once-enjoyed activity, the anticipated pleasure or satisfaction simply fails to materialise.

This has traditionally been recognised as one of the two core features, alongside pervasive low mood, at the heart of a depressive illness, and it is often specifically probed for, since patients may not spontaneously report it despite it being centrally important to how the illness is affecting their life.

Recognition features

A marked reduction or loss of the capacity to experience pleasure from activities previously found enjoyable or rewarding
The person may still go through the motions of a once-enjoyed activity but reports no accompanying sense of satisfaction or pleasure
Often accompanied by a broader loss of interest, though the two can be distinguished by asking specifically about pleasure versus interest
A core, specifically probed-for feature of depressive illness

Eliciting it at interview

Ask specifically about pleasure rather than just interest: "When you do things you used to enjoy, do you still get any pleasure from them?"
Give concrete examples relevant to the person's own life (hobbies, food, time with family) and ask about each specifically
Distinguish from simple loss of motivation to start an activity by asking about the experience during and after the activity, not only the willingness to begin it

Distinguishing features

Differs from apathy, which concerns reduced motivation and interest more broadly, whereas anhedonia specifically concerns the loss of pleasure itself, even when an activity is undertaken
Differs from demoralization, in which enjoyment in unrelated areas of life is generally preserved, whereas anhedonia in depressive illness tends to be more pervasive
A core defining feature of depressive illness rather than a separate, standalone condition

Common misconceptions

That anhedonia is the same as simply not wanting to do things; a person can still engage in an activity and yet report no pleasure from it at all, which is the more specific and telling pattern
That anhedonia only concerns major life activities; it commonly affects small everyday pleasures such as food, music, or company as well

Related phenomena

Depressive Illness · Apathy

Diagnostically relevant to

Major Depressive Disorder (links open the DSM-5 Learning Lab)

Practice this

A 39-year-old man who has played guitar for pleasure most evenings for twenty years continues to pick it up out of habit, but reports that it now feels like going through empty motions, with none of the satisfaction or enjoyment it used to bring him, no matter how long he plays. What is this? · A 45-year-old woman with low mood says she still goes out to dinner with friends every week because "it's just what we do," but when asked directly, admits the food tastes the same as always and the conversation doesn't lift her mood the way it used to — she just goes through the evening. Before revealing the answer: what is this finding, and why is it significant that she still attends despite this? · Two patients each seem to have withdrawn from activities they used to care about. Before revealing the answer, decide what question would tell anhedonia apart from apathy. · You suspect a patient with low mood may also have anhedonia, which they haven't mentioned spontaneously. Before revealing the answer, decide how you would specifically ask about it. · Explain why anhedonia is specifically and routinely asked about in a depression assessment, rather than being assumed to be present whenever a patient reports low mood.

Illustration

References

Casey, P. & Kelly, B. (2019). Fish's Clinical Psychopathology, 4th ed. Ch. 6, 'Disorders of Emotion'.