Mental health & neurodiversity
Persistent low mood
Feeling flat and low for months or years without a clear cause - when low mood is dysthymia or mild depression, and what helps.
If you need urgent help
If you are in crisis, having thoughts of ending your life, or have seriously harmed yourself, this page is not the right route: call 999 or go to A&E now. For urgent but non-life-threatening mental health support, call NHS 111 and select the mental health option, or contact Samaritans free on 116 123, any time, day or night.
Key points
The essentials at a glance.
What to look out for, when to seek help, who assesses and treats it, and the options that work.
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Low mood most days for two years or more may be persistent depressive disorder (dysthymia) - milder than major depression but corrosive over time.
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Signs include low energy, poor self-esteem, pessimism and reduced enjoyment, often dismissed as personality.
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Physical causes such as thyroid problems, anaemia and vitamin deficiency are worth excluding with simple blood tests.
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Effective treatments include CBT, behavioural activation and antidepressants.
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Seek assessment rather than assuming this is just how you are - long-standing low mood responds to treatment.
Understanding it
What it is, and how to get help.
In plain English - what is going on, and the assessment and treatment routes available in the UK.
Persistent low mood that never quite becomes a crisis is easy to normalise, but living permanently at half power has real costs. Dysthymia and chronic mild depression are recognised conditions, frequently missed precisely because people stop remembering what feeling well was like.
Assessment excludes physical contributors and clarifies the diagnosis, and treatment - psychological therapy, medication or both - is effective even when the low mood has lasted years. NHS talking-therapy waits vary widely and can be lengthy, particularly for specialist or longer-term therapy. Privately, an initial appointment with a psychologist or accredited therapist can typically be arranged within around two weeks.
A quiet reminder
This guide is for information, not medical advice.
Your GP or mental health professional knows your history and can tell you which parts apply to you. If in doubt, speak to them.
Published 2026-09-27 · Next review 2027-09-27
Frequently asked
Common questions about Persistent low mood.
Quick, plain-English answers to what people ask us most.
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What is persistent low mood?
Persistent low mood describes a lasting feeling of sadness, flatness, or lack of enjoyment that continues over weeks or months, rather than passing within a few days. It can be a symptom of depression or occur on its own.
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What causes persistent low mood?
Causes range from clinical depression and anxiety to life stressors, relationship difficulties, physical illness, hormonal changes, certain medications, and sometimes an underlying medical condition such as thyroid problems.
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What are the symptoms alongside low mood?
Reduced interest in usually enjoyable activities, fatigue, changes in sleep or appetite, difficulty concentrating, and feelings of worthlessness or hopelessness often accompany persistent low mood.
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Is persistent low mood a sign of depression?
It can be, particularly if it's lasted more than two weeks and is affecting daily functioning, though not everyone with persistent low mood meets the full criteria for clinical depression. A proper assessment can clarify this.
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Can persistent low mood be treated?
Yes, options include psychological therapies such as cognitive behavioural therapy, lifestyle measures like exercise and sleep hygiene, and, when appropriate, antidepressant medication, tailored to the underlying cause and severity.
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How is persistent low mood assessed?
Assessment typically involves discussing the pattern, duration, and impact of symptoms, screening for depression and anxiety, and sometimes blood tests to rule out physical contributors such as thyroid dysfunction or anaemia.
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How long does it take to feel better with treatment?
Talking therapies often show initial benefit within a few weeks, and antidepressants, when used, typically take four to six weeks for a noticeable effect, with continued improvement over subsequent months.
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Persistent low mood vs normal sadness — what's the difference?
Normal sadness usually relates to a specific event and improves over days as circumstances change, while persistent low mood continues regardless of circumstances and lasts for weeks or longer, often affecting daily function.
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When is low mood an emergency?
If you have thoughts of self-harm or suicide, this is a mental health emergency: seek immediate help via 999, your nearest A&E, or the Samaritans on 116 123, available 24 hours a day.
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When should I see a doctor otherwise, and how quickly can I be seen privately?
See a doctor if low mood has lasted more than two weeks or is affecting your life. Private psychiatry or psychology assessment is usually available within about two weeks, considerably quicker than typical NHS mental health service waiting times.