Depression, anxiety and loneliness in later life

01OverviewDefinition, clinical context and the essential points that orientate the chapter.

Ask about pleasure and motivation as well as mood. Explore worry, panic, guilt, hopelessness, sleep, appetite, energy, psychomotor change, concentration, pain, alcohol and function. Older adults may describe nerves, weakness or memory rather than depression. Obtain consented collateral about withdrawal, self-care, medicines and recent losses while preserving private time for suicide and safeguarding questions.

Ask suicide questions plainly and calmly. Determine thoughts, intent, plan, access to medicines or weapons, previous behaviour, substance use, psychosis, reasons for living and ability to use support. A low questionnaire score cannot overrule a concerning narrative. Immediate intent, inability to stay safe or severe self-neglect needs same-day crisis assessment and a documented safety plan.

Screening supports but does not replace diagnosis. PHQ-9 includes somatic symptoms affected by illness; GDS reduces some somatic emphasis. Interpret severity, duration and pervasive functional effect. Bereavement can coexist with major depression. Loneliness is the felt gap between desired and actual connection and should be assessed separately from living arrangement and social-contact count.

Exclude or treat contributors: delirium, cognitive disorder, thyroid or nutritional abnormality, anaemia, pain, sleep apnoea, Parkinson disease, stroke, alcohol and medication effects. Examination and tests are targeted to the phenotype. Review corticosteroids, dopaminergic drugs, sedatives and polypharmacy. New late-life anxiety may be a medical symptom and should not be dismissed.

Use shared decisions around accessible psychological treatment. Behavioural activation schedules small valued activities and breaks avoidance; guided self-help, problem-solving, CBT, group exercise and bereavement support can be adapted for mobility, sensory, language and cognitive needs. Telephone or digital therapy may improve access for some and exclude others; offer a workable modality.

For more severe depression, combine individual CBT with an antidepressant when desired. Start lower and titrate more slowly when frailty, anxiety, interactions or organ impairment increases risk, while avoiding undertreatment through indefinitely subtherapeutic dosing. Explain delayed benefit, early activation, adherence and withdrawal and review within the timeframe set by suicide risk and age.

Sertraline is often chosen for a relatively manageable interaction profile. In a sensitive older adult, start 25 mg each morning and increase to 50 mg after about a week if tolerated, then titrate by response. Check sodium early in people at risk, especially with diuretics or prior hyponatraemia, and review GI bleeding with antiplatelets, anticoagulants or NSAIDs.

Mirtazapine starts 15 mg at night and may increase to 30 mg after one to two weeks according to response, with a maximum 45 mg daily. Sedation, dizziness, appetite and weight change can help or harm depending on the person; rare neutropenia symptoms require urgent FBC. Do not add it simply to sedate an anxious lonely person.

ECT is considered by specialists for severe depression when rapid response is needed, including life-threatening refusal of intake, catatonia, severe suicidality or psychotic depression, or after other treatments fail. Discuss anaesthetic and cognitive risks, capacity and consent or lawful best interests. Continue relapse-prevention treatment and monitor cognition.

Treat loneliness through the person's desired kind of connection: sensory correction, transport, befriending, culturally meaningful groups, volunteering, carer respite, grief support and safe digital access. Screen for exploitation and poverty. Review whether contact improves belonging rather than counting referrals or visits.

Follow symptoms, suicide, function, nutrition, falls, cognition, sodium and medicine burden. A good response includes re-engagement with valued activity, not only a lower score. Persistent symptoms prompt adherence, diagnosis, bipolar, dementia, pain, social adversity and treatment-delivery review and specialist escalation.

Key points

Later-life depression may present as loss of interest, fatigue, pain, poor appetite, sleep change, memory complaint, irritability or functional withdrawal rather than stated sadness.
First-line assessment combines direct interview, collateral and a validated tool such as PHQ-9 or GDS; a score neither diagnoses nor assesses suicide alone.
Ask directly about suicide at initial and follow-up review. Do not assume older age, faith, family presence or bereavement makes risk low.
Use 4AT for acute change and assess cognition, physical disease, pain, sleep, alcohol, medicines, hearing, vision, grief, abuse and practical adversity.
Loneliness is subjective disconnection; living alone is an objective arrangement. Neither automatically means depression, and social contact must match the person's preference.
For less severe depression, first-line options include guided self-help, behavioural activation, structured exercise and psychological treatment chosen with the person.
For more severe depression, NICE supports individual CBT plus an antidepressant when acceptable, with urgent specialist care for psychosis, catatonia or life-threatening intake failure.
A cautious frail-adult sertraline regimen may start 25 mg daily and increase to 50 mg after about one week, with sodium, bleeding and falls review.
Mirtazapine may suit selected insomnia or low-appetite phenotypes but sedation and posture can worsen falls; it is an antidepressant, not a social treatment for loneliness.
Address hearing, transport, digital exclusion, bereavement, carer role and meaningful group or one-to-one connection alongside clinical therapy.

02AetiologyUnderlying causes, associations and risk factors, with why each one matters.

Psychosocial loss and adversity

Bereavement, retirement, reduced role, poverty, isolation, caregiving, trauma and housing or sensory barriers can precipitate mood and anxiety disorders.

Medical and neurological disease

Stroke, Parkinson disease, dementia, pain, cancer, endocrine illness and sleep disturbance alter biology, function and future expectations.

Medicine and substance effects

Corticosteroids, dopaminergic drugs, sedatives, alcohol, withdrawal and some cardiovascular or endocrine treatments can cause or amplify symptoms.

Recurrent psychiatric vulnerability

Earlier depression, anxiety, bipolar disorder, trauma and family susceptibility can recur in later life with a different somatic or cognitive presentation.

03PathophysiologyThe causal sequence from the underlying abnormality to symptoms and harm.

1
Stress and mood-network dysfunction
Chronic stress and altered monoamine, limbic and prefrontal regulation affect emotion, motivation, sleep and cognitive control.
2
Inflammation and vascular burden
Systemic inflammation and cerebrovascular injury contribute to later-life depression, slowed processing and poorer treatment response. This influences cognition, mobility and everyday functional reserve.
3
Behavioural withdrawal loop
Low energy and threat anticipation reduce activity and contact, causing deconditioning, fewer rewarding experiences and deeper isolation.
4
Cognitive-affective interaction
Rumination and impaired concentration produce memory complaints, while dementia and executive dysfunction reduce coping and treatment access.
5
Social disconnection physiology
Persistent loneliness increases vigilance, sleep disturbance and stress responses, but it is an experience requiring relational assessment rather than a diagnosis itself.

04Clinical features and red flagsSymptoms, examination findings, patterns of presentation and time-critical warnings.

Anhedonic-somatic presentation

Loss of interest, low energy, pain, sleep, appetite and slowed function dominate over volunteered sadness.

Anxious depression

Persistent worry, agitation, reassurance seeking and bodily fear occur with hopelessness and reduced pleasure.

Cognitive complaint

Concentration and retrieval fail during depression, but collateral progressive IADL loss may reveal coexisting dementia.

Subjective loneliness

The person feels disconnected despite contact, or contentedly lives alone without loneliness; preference determines meaning.

High suicide riskRed flag

Intent, plan, means, psychosis, severe hopelessness or inability to maintain safety requires immediate action.

Psychotic or catatonic depressionRed flag

Nihilistic guilt, hallucination, stupor, mutism or refusal of intake requires urgent specialist treatment.

Red flags requiring action

Ask directly about thoughts of death, self-harm, intent, plan, means, previous attempts, substance use, protective factors and current ability to remain safe.
New confusion, altered arousal or abrupt withdrawal is delirium until assessed and cannot be diagnosed as depression from a questionnaire.
Psychotic guilt, nihilistic delusion, starvation, stupor or severe psychomotor change requires urgent old-age psychiatry assessment.
Anxiety with chest pain, syncope, focal neurology, hypoxia, hypoglycaemia or thyroid symptoms needs parallel medical evaluation.
Bereavement does not protect against major depression or suicide; assess duration, pervasive symptoms, function, guilt and hopelessness.
Financial control, isolation by others, neglect or fear at home raises safeguarding concern rather than uncomplicated loneliness.

05InvestigationsWhat to request, why it matters and how to interpret it.

Investigation order

Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.

01
Clinical mood and anxiety interviewFirst step
Why
Establish syndrome, chronology and function.
Interpretation and limitations
Assess core symptoms, worry, psychosis, mania history, grief, pain, sleep, substances, medical illness and impairment.
02
Direct suicide assessment
Why
Formulate immediate and longer-term risk.
Interpretation and limitations
Document thought, intent, plan, means, previous behaviour, protective factors, capacity, safeguarding and ability to use support.
03
PHQ-9 or GDS
Why
Support severity and response monitoring.
Interpretation and limitations
Interpret somatic items, cognition, language and medical illness and never use the total as a suicide or diagnosis substitute.
04
4AT and cognitive assessment
Why
Separate delirium and possible dementia.
Interpretation and limitations
Use 4AT for acute change and collateral function and accessible cognition for persistent concerns after physiology stabilises.
05
Medicine and physical work-up
Why
Find medical mimics and prescribing risks.
Interpretation and limitations
Review alcohol and medicines and select FBC, renal, liver, sodium, calcium, glucose, thyroid, B12 or other tests from history.
06
Loneliness and social map
Why
Identify desired connection and practical barriers.
Interpretation and limitations
Ask relationship quality, bereavement, culture, hearing, transport, caring, finance, digital access, exploitation and preferred support.
07
Treatment-safety baseline
Why
Prepare antidepressant or ECT care.
Interpretation and limitations
Assess sodium risk, bleeding, falls, QT or ECG indication, bipolarity, organ function, interactions, cognition and anaesthetic fitness as relevant.

06Differential diagnosisRealistic alternatives and the features that help distinguish them.

Delirium

Acute fluctuation, inattention and altered arousal indicate physiological brain failure despite apparent withdrawal or anxiety. Distinguish it through chronology, examination and targeted testing.

Dementia or mild cognitive impairment

Progressive collateral IADL decline and domain-specific deficits suggest neurocognitive disease; depression and dementia commonly coexist. Distinguish it through chronology, examination and targeted testing.

Bipolar disorder or psychosis

Past mania, reduced need for sleep, grandiosity or psychosis changes antidepressant safety and needs specialist diagnosis.

Medical and medicine causes

Thyroid disease, anaemia, B12 deficiency, pain, sleep apnoea, Parkinson disease, corticosteroids and substance use can mimic or compound symptoms.

Grief and loneliness without disorder

Painful loss or social disconnection may not meet depressive criteria but still warrants support and repeated risk assessment.

07ManagementImmediate care, first-line treatment, alternatives and escalation.

01First-line assessmentDiagnose, assess risk and find contributorsFirst stepFirst linePersistent low mood, anxiety, withdrawal, somatic or cognitive complaint occurs.

1Optimise communication and assess suicide, psychosis, mania, delirium and immediate medical danger.
2Use clinical interview, collateral and validated screening with functional, medicine, physical and social assessment.
3Agree severity, goals and a psychological, social and if appropriate medicine plan with early review.

02Less severe depressionRestore activity and agencySymptoms cause impairment without high risk, psychosis or severe biological compromise.

1PreferredOffer guided self-help, behavioural activation, structured exercise or another preferred NICE-supported psychological option.
2Treat pain, sensory and practical barriers and reconnect the person with chosen meaningful roles and relationships.
3Review symptoms, function and suicide risk and step up treatment when improvement is inadequate.

03More severe depressionCombine effective treatments and monitor closelySymptoms are more severe, recurrent or substantially impair intake, self-care or function.

1Offer individual CBT plus an antidepressant when acceptable, using cautious but therapeutic titration and interaction review.
2Set early suicide, sodium, falls, bleeding, activation and adherence review and involve old-age psychiatry for complexity.
3Consider specialist ECT when a rapid response is required or adequate treatment has failed.

04Loneliness interventionMatch connection to the person's preferenceSubjective disconnection contributes to distress or health behaviour.

1Identify the missing relationship quality and hearing, transport, caring, money, safety or digital barriers.
2Offer a chosen one-to-one, group, cultural, volunteering, bereavement or social-prescribing route with practical access support.
3Review belonging, mood and burden rather than equating referral or contact count with success.

Key medicines and prescribing safety2 treatments · regimens, roles and cautions

Common SSRI option for moderate-to-severe depression or persistent anxiety alongside psychological and social care.

Sertraline

For a sensitive or frail older adult, start 25 mg orally once daily and increase to 50 mg after about one week if tolerated; later increases follow response, adverse effects and product-guided maximum dosing.

Review early activation and suicide, hyponatraemia, GI effects, bleeding with antithrombotics or NSAIDs, falls, serotonin interactions, hepatic impairment and gradual withdrawal.

Alternative antidepressant when sleep, appetite, sexual adverse effects or SSRI interaction profile influence shared selection.

Mirtazapine

Start 15 mg orally at night and consider 30 mg after one to two weeks according to response and tolerance; the licensed maximum is 45 mg once daily.

Sedation, dizziness, posture and weight gain can harm mobility; review mania risk and withdrawal and obtain urgent FBC for fever, sore throat or other neutropenia symptoms.

08ComplicationsImportant consequences, why they occur and why they matter clinically.

Suicide and self-neglect

Hopelessness, isolation, pain, access to medicines and under-recognition can lead to lethal attempts, malnutrition or untreated illness.

Functional and physical decline

Inactivity, poor intake, sleep disruption and missed treatment worsen frailty, falls, vascular disease and recovery. Anticipatory multidisciplinary prevention and review are therefore important.

Cognitive impairment

Depression impairs attention and executive function and may reveal or accelerate functional impact from coexisting dementia.

Medicine adverse effects

Hyponatraemia, bleeding, falls, QT effects, activation, withdrawal and interactions are more likely with multimorbidity and polypharmacy.

Carer and relationship strain

Anxiety, reassurance seeking, irritability and dependency burden carers and can deepen reciprocal isolation. Anticipatory multidisciplinary prevention and review are therefore important.

09Monitoring and follow-upTreatment response, safety checks and longer-term review.

Review suicide and self-neglect at every material change and earlier than routine symptom review when risk, age or activation warrants.
Track PHQ-9 or GDS with pleasure, activity, intake, sleep, cognition and actual ADLs rather than score alone.
Check sodium after SSRI initiation or dose change in high-risk people and review falls, bleeding, GI and serotonin interactions.
Ask whether psychological and social interventions were accessible and attended and whether they increased meaningful connection.
Reopen bipolar, dementia, pain, medical disease, adherence and safeguarding when response is absent or unexpectedly variable.
After remission agree continuation duration, relapse signs and gradual withdrawal rather than abrupt antidepressant cessation.

10Special situationsVariants, exceptions and circumstances that change the usual approach.

Sadness may be absent

Anhedonia, fatigue, pain and functional withdrawal can carry the diagnosis even when the person denies feeling depressed.

Loneliness is not headcount

A busy household can feel isolating and living alone can be satisfying; desired relationship quality is decisive.

Bereavement and depression coexist

A plausible loss does not remove the need to assess pervasive disorder, psychosis and suicide.

Cognition needs follow-up

Improved concentration after mood treatment does not exclude coexisting neurodegenerative decline.

Start low is not stay low

Cautious initiation must progress to an effective tolerated dose or a reasoned alternative.

Contact must be accessible

A digital or group offer fails when hearing, transport, culture or caring duties prevent meaningful participation.

11Common pitfallsFrequent interpretation and management errors.

01
Assuming older adults will volunteer suicidal thought without direct respectful questioning.
02
Diagnosing depression from a score during delirium or without functional and medical assessment.
03
Calling loneliness depression and prescribing medicine instead of addressing desired connection.
04
Treating bereavement as protection from severe depression or suicide.
05
Starting an SSRI without sodium, bleeding, falls and interaction planning.
06
Leaving a frail patient indefinitely at a subtherapeutic starter dose without review.
07
Using mirtazapine solely as a sleeping tablet despite postural and sedation harm.
08
Offering online or group care without testing sensory, transport and cultural access.