MOOD AND ANXIETY · ARTICLE 01
Depression
Symptoms, assessment and treatment
Depression is more than feeling sad or having a difficult period. It can affect how a person thinks, feels, relates to others and experiences everyday life. Even familiar activities may begin to require considerable effort, while the future can appear difficult to imagine with any sense of possibility.
Depression is a recognised mental health condition, not a character flaw or evidence of personal weakness. It can affect people across different ages, backgrounds and circumstances, including those whose lives appear outwardly stable or successful.
1. What does depression feel like?
Depression does not present in the same way for everyone. For some people, it involves persistent sadness, tearfulness or hopelessness. For others, the more prominent experience is emotional numbness: a diminished capacity to feel pleasure, interest, affection or connection. Irritability, anxiety and feeling overwhelmed may also be central.
Activities that once provided enjoyment can begin to feel meaningless. Concentration may become difficult, decisions can feel disproportionately demanding, and ordinary responsibilities may require sustained effort. Some people withdraw from relationships because maintaining contact has become exhausting or they feel unable to explain what they are experiencing.
Depression can affect sleep, appetite, weight and energy. Some people wake early or sleep much more than usual; others experience physical discomfort or agitation. Guilt, self-criticism and feelings of worthlessness may become more convincing, while positive experiences seem less significant. These experiences are real, but the conclusions depression encourages a person to draw about themselves are not necessarily accurate.
2. Why does depression develop?
There is no single explanation for depression. Its development is generally understood through the interaction of biological, psychological and social influences. Genetic vulnerability, physical health, sleep disruption and changes in life circumstances may contribute. Bereavement, relationship difficulties, prolonged stress, financial insecurity, isolation and significant transitions can also affect emotional well-being.
Psychological experiences can be relevant, too. Persistent self-criticism, unresolved loss, relationship difficulties and a sense of having little control may contribute to the development or maintenance of depressive symptoms. From a psychodynamic perspective, attention may also be given to earlier relationships, internal expectations and ways of managing difficult feelings. This is one perspective, not a universal explanation.
These influences do not operate in isolation. Identifying a contributing factor does not mean that a person caused their own depression. Understanding the circumstances can help inform treatment, but recovery does not depend on finding one definitive explanation.
3. Assessment: when and how to seek help
Low mood is a common response to difficult experiences. Depression becomes a particular concern when symptoms persist, affect everyday functioning or substantially diminish quality of life. NHS guidance advises contacting a GP when symptoms occur for most of the day, every day, for more than two weeks. Seek help sooner if symptoms are severe, worsening or difficult to manage.
Assessment usually involves a conversation about emotional and physical symptoms, their duration, their effect on daily life, relevant life events and previous episodes. A GP may ask about sleep, appetite, concentration, relationships, medical history and thoughts of self-harm or suicide. Questionnaires may support the process, but a score alone does not establish the full clinical picture.
Physical conditions and certain medicines can produce symptoms resembling depression, so further assessment may be considered. It is also important to mention any previous periods of unusually elevated mood or increased energy, as these may indicate a different mood disorder.
4. Treatment: what can help?
Treatment depends on symptom severity and duration, previous experiences, personal circumstances and preferences. Psychological therapies can help people understand and address patterns of thought, behaviour and emotional experience. Cognitive behavioural therapy (CBT) examines how thoughts and behaviours may maintain distress; interpersonal and psychodynamic therapies may help explore relationship difficulties, loss and recurring emotional patterns.
Antidepressant medication may be appropriate depending on the severity of depression, the person's history and their preferences. A prescriber should explain potential benefits, side effects and withdrawal effects, and arrange appropriate review. Medication should not be stopped abruptly without professional advice.
Practical and social support can contribute to recovery. This may include addressing sleep difficulties, gradually reintroducing manageable activities, maintaining contact with trusted people and seeking help with work, caring responsibilities or financial pressures. These measures are not substitutes for appropriate treatment when depression is significant.
5. Recovery: a process rather than a test
Recovery does not always happen quickly or in a straight line. Improvement may begin with small changes: sleeping more regularly, finding it easier to concentrate, reconnecting with someone or experiencing brief moments of interest. These changes can be meaningful even when low mood has not fully lifted.
A recurrence of symptoms does not automatically mean that treatment has failed. Recognising personal warning signs, maintaining appropriate support and discussing changes with a professional can help reduce the impact of future episodes.
For some people, recovery involves reconsidering expectations, acknowledging losses, changing unsustainable circumstances or developing a different relationship with vulnerability and dependence on others. There is no requirement to turn depression into a positive experience or discover a lesson within it. Recovery can simply mean regaining a sense of possibility, agency and connection with everyday life.
When to seek urgent help
If you are experiencing thoughts of suicide or self-harm, tell someone you trust and seek professional help. In England, call NHS 111 and select the mental health option for urgent support. If you or someone else is in immediate danger, call 999 or go to A&E.
Further reading and sources
NHS – Depression in adults: overview
NHS – Diagnosis and assessment
NHS – Treatment options
NICE – Depression in adults: treatment and management