Depression

What is depression?

Depression is a common medical condition that affects mood, thinking, energy, and the body. It is more than feeling sad for a few days after a disappointment. When doctors use the word depression, they usually mean a persistent low mood or loss of interest that lasts at least two weeks and interferes with daily life. The formal name for the most common form is major depressive disorder. Other terms you may hear include clinical depression, persistent depressive disorder (a milder but long-lasting form, sometimes called dysthymia), and perinatal or postpartum depression (depression that begins during pregnancy or in the months after birth).

Depression can affect anyone at any age, including children, teenagers, and older adults. It is diagnosed somewhat more often in women, although men are also affected and may be less likely to describe their symptoms as sadness. Depression is not a sign of weakness or a personal failing, and it is not something a person can simply decide to get over. It is a health condition with recognized causes and established treatment options, and many people improve with appropriate care.

In hospital settings, depression is usually managed by psychiatrists (medical doctors who specialize in mental health) and psychologists (professionals trained in talking therapies and psychological assessment). At Acibadem, this care is provided through the Psychiatry & Psychology department.

Symptoms of depression

Depression symptoms vary from person to person. Some people mainly notice changes in mood; others notice changes in sleep, appetite, or energy first. Doctors generally look for a cluster of symptoms that persist most of the day, nearly every day, for at least two weeks. Common depression symptoms include:

• Persistent low mood, sadness, emptiness, or feeling tearful
• Loss of interest or pleasure in activities that used to be enjoyable (doctors call this anhedonia)
• Changes in sleep, such as trouble falling or staying asleep, or sleeping much more than usual
• Changes in appetite or weight, either eating less or more than usual
• Fatigue or low energy, even after rest
• Difficulty concentrating, remembering, or making decisions
• Feelings of worthlessness, hopelessness, or excessive guilt
• Restlessness or slowed movement and speech that others may notice
• Irritability, anger, or frustration, which is especially common in men and teenagers
• Unexplained physical complaints, such as headaches, back pain, or digestive problems
• Thoughts of death or suicide, or thoughts that life is not worth living

Not everyone has all of these symptoms, and a person does not need to feel sad all the time to have depression. Some people describe feeling numb or flat rather than sad.

Symptoms can also differ by type. In persistent depressive disorder, symptoms are often milder but last two years or more. In seasonal patterns of depression, symptoms tend to appear in the darker months and lift in spring. In perinatal depression, low mood may be mixed with intense worry about the baby. In older adults, depression may show up mainly as memory problems, physical complaints, or withdrawal, and can be mistaken for normal aging. In children and adolescents, irritability, falling grades, or refusing to go to school may be more obvious than sadness.

Severity also matters. Mild depression may allow a person to keep working and socializing with effort. Moderate depression usually causes clear difficulty at work, school, or in relationships. Severe depression can make basic tasks such as getting out of bed, eating, or washing very hard, and may be accompanied by suicidal thoughts. In some cases of severe depression, a person may experience psychotic symptoms, meaning false beliefs (delusions) or hearing or seeing things others do not (hallucinations).

Causes and risk factors

There is rarely a single cause of depression. Doctors and researchers generally believe depression develops from a combination of biological, psychological, and social factors that interact differently in each person. Understanding possible depression causes can help make sense of the condition, but it is not usually possible to point to one exact trigger.

Factors that are thought to contribute include:

• Brain chemistry and biology. Depression is linked to changes in how brain circuits and chemical messengers, such as serotonin and norepinephrine, regulate mood, sleep, and stress. The exact mechanism is still being studied.
• Genetics. Depression tends to run in families. Having a parent or sibling with depression raises a person’s likelihood of developing it, although many people with a family history never become depressed, and many with no family history do.
• Stressful or traumatic life events. Bereavement, relationship breakdown, job loss, financial problems, abuse, or neglect, especially in childhood, are often associated with the start of depression.
• Hormonal changes. Pregnancy, the postpartum period, menopause, and thyroid problems can all affect mood.
• Other medical conditions. Long-term or serious illnesses such as heart disease, cancer, diabetes, chronic pain, stroke, and Parkinson’s disease are frequently accompanied by depression.
• Medications and substances. Some prescription medicines can contribute to low mood, and alcohol or drug misuse is closely linked with depression in both directions.
• Personality and thinking patterns. People who are very self-critical, prone to worry, or who have low self-esteem may be more vulnerable.
• Social isolation. Loneliness, lack of support, and discrimination are recognized risk factors.

Having risk factors does not mean a person will develop depression, and depression can occur in people with no obvious risk factors at all.

Diagnosis of depression

There is no blood test, scan, or single laboratory result that confirms depression. A depression diagnosis is a clinical diagnosis, which means it is based on a careful conversation with a trained professional about symptoms, their duration, and their effect on daily life. Doctors compare what they learn against standard criteria, most commonly those in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) or the International Classification of Diseases (ICD-11). In broad terms, the criteria require several core symptoms, including low mood or loss of interest, lasting at least two weeks and causing meaningful distress or impairment.

A typical assessment may include:

• A clinical interview covering current symptoms, when they began, past episodes, family history, stress, sleep, appetite, alcohol and drug use, and any thoughts of self-harm.
• Screening questionnaires such as the Patient Health Questionnaire-9 (PHQ-9), the Hamilton Depression Rating Scale, or the Beck Depression Inventory. These give a rough measure of severity and help track change over time, but they do not diagnose on their own.
• A physical examination and blood tests. These are used to rule out other causes of similar symptoms, such as an underactive thyroid, anemia, vitamin B12 or vitamin D deficiency, or infection. Your doctor may also review your current medications.
• Screening for other mental health conditions. Doctors will usually ask about periods of unusually high energy or mood, because bipolar disorder (a condition with both depressive and elevated episodes) is treated differently from depression. They may also ask about anxiety, trauma, and eating problems.

Brain imaging such as MRI or CT is not routinely used to diagnose depression. It may be ordered only if the doctor suspects a neurological cause, for example if symptoms began suddenly after a head injury or with unusual physical signs.

Because depression can look like other conditions and often occurs alongside them, a diagnosis is sometimes revised over time as more information becomes available. This is a normal part of good care rather than a sign that something went wrong.

Treatment options for depression

Depression treatment options are usually chosen according to how severe the symptoms are, how long they have lasted, what has helped or not helped before, other health conditions, and personal preference. Treatment often combines more than one approach, and it can take some time to find the right fit.

Active monitoring and lifestyle support. For mild depression, a doctor may first suggest a period of watchful waiting with regular follow-up, alongside practical measures such as regular physical activity, a consistent sleep routine, limiting alcohol, and staying connected with others. Guided self-help programs, including structured online programs, are sometimes offered at this stage.

Psychotherapy (talking therapy). Several types of therapy have good evidence for depression. Cognitive behavioral therapy (CBT) helps people identify and change unhelpful thinking and behavior patterns. Interpersonal therapy focuses on relationships and life changes. Behavioral activation encourages gradually re-engaging with meaningful activities. Other approaches include problem-solving therapy and, for some people, longer-term psychodynamic therapy. Therapy is usually delivered over weeks to months, individually or in groups.

Medication. Antidepressants are medicines that act on brain chemical messengers involved in mood. The most commonly prescribed group is the selective serotonin reuptake inhibitors (SSRIs). Others include serotonin-norepinephrine reuptake inhibitors (SNRIs), atypical antidepressants, and older classes such as tricyclics, which are used less often because of side effects. Antidepressants typically take several weeks to have a noticeable effect, and doctors usually recommend continuing them for a number of months after improvement to reduce the chance of relapse. Side effects vary by medicine and often lessen over time. Stopping antidepressants suddenly can cause withdrawal-type symptoms, so changes should be planned with a doctor. For moderate to severe depression, combining medication with psychotherapy is often recommended.

Brain stimulation procedures. When depression is severe or has not responded to several treatments, a psychiatrist may discuss procedures. Electroconvulsive therapy (ECT) is performed under general anesthesia and uses a brief, controlled electrical stimulus to the brain; it is one of the most effective options for severe or life-threatening depression and is carried out in a hospital setting. Repetitive transcranial magnetic stimulation (rTMS) uses magnetic pulses applied to the scalp while the person is awake and is used for some cases of treatment-resistant depression. In some countries, esketamine nasal spray is available under medical supervision for depression that has not responded to other treatments. These options involve specific risks and benefits that your doctor will explain.

Hospital care. A short admission may be recommended if a person is at immediate risk of harming themselves, cannot care for basic needs, or has psychotic symptoms. The goal is safety and stabilization, after which treatment continues in the community.

Surgery is not a treatment for depression in routine practice. Experimental approaches such as deep brain stimulation are studied only in specialized research programs.

Rehabilitation and ongoing support. Recovery often includes gradual return to work or study, support groups, family involvement, and relapse-prevention planning. Treating other conditions such as anxiety, insomnia, chronic pain, or substance use is also an important part of care.

Living with depression and outlook

Depression is a treatable condition, and most people who receive appropriate treatment experience meaningful improvement. Improvement is often gradual rather than sudden, and it is common to have better and worse days during recovery. Some people have a single episode and never experience another. Others have recurring episodes, sometimes separated by years, and a smaller group have long-lasting symptoms that require ongoing management. Having had one episode does raise the likelihood of another, which is why doctors focus on relapse prevention.

Things that people commonly find helpful alongside professional treatment include keeping a regular daily routine, getting physical activity, protecting sleep, limiting alcohol, staying in contact with trusted people even when it feels difficult, and learning to recognize early warning signs of a relapse such as sleep changes or withdrawing from others. Caring for family members and friends also matters; supporting someone with depression can be demanding, and carers benefit from information and support themselves.

It is worth remembering that depression affects how a person sees the future. Hopelessness is a symptom of the illness, not an accurate prediction. Many people who once felt that nothing would help do recover, and those who have not responded to one treatment often respond to another.

Frequently asked questions

What is the difference between depression and normal sadness?

Sadness is a normal response to loss or disappointment, and it usually eases with time and support. Depression lasts longer, typically at least two weeks, affects most of the day nearly every day, and comes with other changes such as loss of interest, disturbed sleep, low energy, and difficulty functioning. Grief after a death can resemble depression, and the two can overlap; a doctor can help tell them apart.

What are the first signs of depression symptoms?

Early depression symptoms differ between people, but common first signs include losing interest in things you used to enjoy, feeling tired without a clear reason, sleeping poorly or too much, becoming irritable or withdrawn, and finding it harder to concentrate. Because these changes are gradual, family members sometimes notice them before the person does.

What causes depression to start suddenly?

Depression usually develops over weeks rather than overnight, but it can seem sudden when it follows a clear event such as a bereavement, childbirth, a serious illness, or a major stress. In some cases a medication, a thyroid problem, or substance use contributes. Often there is no single identifiable cause, and depression can begin during a period of life that seems outwardly stable.

How is a depression diagnosis made if there is no test?

Doctors diagnose depression through a structured conversation about your symptoms, how long they have lasted, and how they affect your life, guided by standard diagnostic criteria. Questionnaires such as the PHQ-9 help measure severity. Blood tests may be used to rule out physical conditions that mimic depression, but they cannot confirm it. The diagnosis rests on clinical judgment rather than a laboratory result.

What are the main depression treatment options?

The main options are psychotherapy, particularly cognitive behavioral therapy and related approaches; antidepressant medication; and, for severe or treatment-resistant depression, brain stimulation procedures such as electroconvulsive therapy or transcranial magnetic stimulation. Lifestyle measures and social support are recommended alongside these. Many people do best with a combination, and the plan is usually adjusted over time.

Can depression go away on its own?

Some episodes of mild depression do improve without formal treatment, particularly if the stress that triggered them resolves. However, untreated depression can last many months, can become more severe, and carries risks including suicide. Because it is not possible to predict who will recover without help, seeking assessment is generally advised if symptoms persist beyond a couple of weeks.

Do antidepressants change your personality?

Antidepressants are not intended to change who you are. When they work, most people describe feeling more like themselves rather than different. Some people experience side effects such as emotional blunting, nausea, sleep changes, or sexual side effects, and these should be discussed with the prescribing doctor, who may adjust the dose or medicine.

When to see a doctor

It is reasonable to talk to a doctor if low mood, loss of interest, or other depression symptoms have lasted more than two weeks, are affecting your work, relationships, or ability to care for yourself, or are getting worse. You do not need to be sure that you have depression before seeking an assessment; part of the doctor’s role is to help work out what is happening.

Seek urgent help immediately, through emergency services or the nearest emergency department, if you or someone you know has any of the following:

• Thoughts of suicide or of ending your life, especially with a plan or the means to carry it out
• Self-harm, or a strong urge to harm yourself
• Thoughts of harming others, including, in new parents, thoughts of harming the baby
• Hearing voices or holding beliefs that others find impossible or frightening
• Being unable to eat, drink, or get out of bed for a prolonged period
• Sudden confusion, severe agitation, or a rapid, unexplained change in behavior
• A sudden sense of calm after severe depression, which can sometimes indicate a decision to act on suicidal thoughts

If someone is in immediate danger, do not leave them alone. Depression is treatable, and urgent situations can be managed safely with the right professional support.