According to the Centers for Disease Control and Prevention (CDC), 7.6 percent of people over the age of 12 have depression in any 2-week period. This is substantial and shows the scale of the issue.
According to the World Health Organization (WHO), depression is the most common illness worldwide and the leading cause of disability. They estimate that 350 million people are affected by depression, globally.
- Depression seems to be more common among women than men.
- Symptoms include lack of joy and reduced interest in things that used to bring a person happiness.
- Life events, such as bereavement, produce mood changes that can usually be distinguished from the features of depression.
- The causes of depression are not fully understood but are likely to be a complex combination of genetic, biological, environmental, and psychosocial factors.
Depression is a mood disorder characterized by persistently low mood and a feeling of sadness and loss of interest. It is a persistent problem, not a passing one, lasting on average 6 to 8 months.
Diagnosis of depression starts with a consultation with a doctor or mental health specialist. It is important to seek the help of a health professional to rule out different causes of depression, ensure an accurate differential diagnosis, and secure safe and effective treatment.
As for most visits to the doctor, there may be a physical examination to check for physical causes and coexisting conditions. Questions will also be asked - "taking a history" - to establish the symptoms, their time course, and so on.
Some questionnaires help doctors to assess the severity of depression. The Hamilton depression rating scale, for example, has 21 questions, with resulting scores describing the severity of the condition. The Hamilton scale is one of the most widely used assessment instruments in the world for clinicians rating depression.
What does not class as depression?
Depression is different from the fluctuations in mood that people experience as a part of normal life. Temporary emotional responses to the challenges of everyday life do not constitute depression.
Likewise, even the feeling of grief resulting from the death of someone close is not itself depression if it does not persist. Depression can, however, be related to bereavement - when depression follows a loss, psychologists call it a "complicated bereavement."
Signs and symptoms
Symptoms of depression can include:
- depressed mood
- reduced interest or pleasure in activities previously enjoyed, loss of sexual desire
- unintentional weight loss (without dieting) or low appetite
- insomnia (difficulty sleeping) or hypersomnia (excessive sleeping)
- psychomotor agitation, for example, restlessness, pacing up and down
- delayed psychomotor skills, for example, slowed movement and speech
- fatigue or loss of energy
- feelings of worthlessness or guilt
- impaired ability to think, concentrate, or make decisions
- recurrent thoughts of death or suicide, or attempt at suicide
The causes of depression are not fully understood and may not be down to a single source. Depression is likely to be due to a complex combination of factors that include:
- biological - changes in neurotransmitter levels
- psychological and social (psychosocial)
Some people are at higher risk of depression than others; risk factors include:
- Life events: These include bereavement, divorce, work issues, relationships with friends and family, financial problems, medical concerns, or acute stress.
- Personality: Those with less successful coping strategies, or previous life trauma are more suceptible.
- Genetic factors: Having a first-degree relatives with depression increases the risk.
- Childhood trauma.
- Some prescription drugs: These include corticosteroids, some beta-blockers, interferon, and other prescription drugs.
- Abuse of recreational drugs: Abuse of alcohol, amphetamines, and other drugs are strongly linked to depression.
- A past head injury.
- Having had one episode of major depression: This increases the risk of a subsequent one.
- Chronic pain syndromes: These and other chronic conditions, such as diabetes, chronic obstructive pulmonary disease, and cardiovascular disease make depression more likely.
Depression is a treatable mental illness. There are three components to the management of depression:
- Support, ranging from discussing practical solutions and contributing stresses, to educating family members.
- Psychotherapy, also known as talking therapies, such as cognitive behavioral therapy (CBT).
- Drug treatment, specifically antidepressants.
Psychological or talking therapies for depression include cognitive-behavioral therapy (CBT), interpersonal psychotherapy, and problem-solving treatment. In mild cases of depression, psychotherapies are the first option for treatment; in moderate and severe cases, they may be used alongside other treatment.
CBT and interpersonal therapy are the two main types of psychotherapy used in depression. CBT may be delivered in individual sessions with a therapist, face-to-face, in groups, or over the telephone. Some recent studies suggest that CBT may be delivered effectively through a computer
Interpersonal therapy helps patients to identify emotional problems that affect relationships and communication, and how these, in turn, affect mood and can be changed.
Antidepressants are drugs available on prescription from a doctor. Drugs come into use for moderate to severe depression, but are not recommended for children, and will be prescribed only with caution for adolescents.
A number of classes of medication are available in the treatment of depression:
- selective serotonin reuptake inhibitors (SSRIs)
- monoamine oxidase inhibitors (MAOIs)
- tricyclic antidepressants
- atypical antidepressants
- selective serotonin and norepinephrine reuptake inhibitors (SNRI)
Each class of antidepressant acts on a different neurotransmitter. The drugs should be continued as prescribed by the doctor, even after symptoms have improved, to prevent relapse.
A warning from the Food and Drug Administration (FDA) says that "antidepressant medications may increase suicidal thoughts or actions in some children, teenagers, and young adults within the first few months of treatment."
Any concerns should always be raised with a doctor - including any intention to stop taking antidepressants.
Exercise and other therapies
Aerobic exercise may help against mild depression since it raises endorphin levels and stimulates the neurotransmitter norepinephrine, which is related to mood.
Brain stimulation therapies - including electroconvulsive therapy - are also used in depression. Repetitive transcranial magnetic stimulation sends magnetic pulses to the brain and may be effective in major depressive disorder.
Severe cases of depression that have not responded to drug treatment may benefit from electroconvulsive therapy (ECT); this is particularly effective for psychotic depression.
Unipolar and bipolar depression
If the predominant feature is a depressed mood, it is called unipolar depression. However, if it is characterized by both manic and depressive episodes separated by periods of normal mood, it is referred to as bipolar disorder (previously called manic depression).
Unipolar depression can involve anxiety and other symptoms - but no manic episodes. However, research shows that for around 40 percent of the time, individuals with bipolar disorder are depressed, making the two conditions difficult to distinguish.
Major depressive disorder with psychotic features
This condition is characterized by depression accompanied by psychosis. Psychosis can involve delusions - false beliefs and detachment from reality, or hallucinations - sensing things that do not exist.
Women often experience "baby blues" with a newborn, but postpartum depression - also known as postnatal depression - is more severe.
Major depressive disorder with seasonal pattern
Previously called seasonal affective disorder (SAD), this condition is related to the reduced daylight of winter - the depression occurs during this season but lifts for the rest of the year and in response to light therapy.
Countries with long or severe winters seem to be affected more by this condition.
Depression is a mood state that can significantly impact an individual’s entire life; major depression is a condition that goes far beyond feeling sad or upset. Depression affects a person’s mood, thoughts, feelings, behaviors, and physical health. Severe depression can result in losing the ability to feel pleasure in formerly-enjoyable activities and/or social relationships. People struggling with depression struggle with a loss of energy and motivation which can negatively influence the ability to be productive at work or school. Depression – notably untreated depression – is a major risk for suicide due to the deep despair and hopelessness depression causes. Suicide may feel like the only way to escape the pain. If you or someone you love is considering suicide, don’t hesitate to call 911 immediately – this is a medical emergency.
Sometimes, depression can become so severe that some people feel unable to function in major areas of their life, which can lead to feelings of helplessness and hopelessness. While depression can cause a significant problem in a person’s life, there is much hope. Even the most severe cases of depression can be treated with a combination of self-care approaches, therapeutic interventions, and medications.
Approximately 7% of the U.S. population suffers from depression, though this rate varies significantly according to gender and age. While there are no gender differences in childhood, starting in adolescence a difference begins to become evident. Overall, women are 70% more likely to suffer from depression during their lives than men. People aged 18 to 29 are significantly more likely to suffer from depression than individuals over the age of 60. The most common age of onset is in a person’s 20s though depression can begin late in life – especially in men.
There are a number of disorders that frequently occur alongside depression and depressive disorders. The most common co-occurring, co-morbid conditions can include:
- Anxiety disorders
- Panic disorder
- Obsessive-compulsive disorder (OCD)
- Substance abuse
- Eating disorders
- Borderline personality disorder
Causes of Depression
While there does not appear to be a single cause for depression, there are a number of environmental, genetic, and physical reasons one person develops depression while another does not. The most commonly cited causes for depression can include:
Neurotransmitters: There are several chemicals in the brain that are involved in mood regulation including serotonin and dopamine. When these levels of neurotransmitters are not properly balanced, depression can result.
Brain Structures: Through neuroimaging studies (MRIs, CT Scans), researchers have noted there to be differences in the size and shape in areas of the brain responsible for mood, sleep, and appetite although these changes have not been conclusively linked to depression.
Genetics: Depression has been found to run in families – people who have a first-degree relative who has depression are at greater risk for developing the disorder than those without a similar family history. However, many people who develop depression do not have a family history of the disorder. Research suggests that it’s likely that there are multiple genes working together that are responsible for depression rather than a single gene.
Psychological Factors: Some people are born with a personality that includes a depressive way of thinking – they believe a positive event is related to others, while negative events are always their fault.
Environmental Factors – There are many negative life events and major stressors associated with the onset of depression, including job loss, loss of loved one, trauma, problematic relationships, and lack of a sufficient social network.
Signs and Symptoms of Depression
Depression may persist for a long period time, remaining undiagnosed, as the symptoms a person experiences may not always include easily identifiable as being depression. Symptoms and signs of depression will vary based upon age, length of symptoms, and individual temperament. Common symptoms of depression can include:
- Depressed mood almost every day for long periods of time
- Loss of interest or enjoyment in practically all activities
- Sense of worthlessness or guilt with no reason
- Loss of interest in sexual activities or desire
- Lack of energy
- Increase or decrease in appetite
- Increase or decrease in sleep
- Somatic complaints, in particular pain
- Feeling emotionally numb
- Social withdrawal
- Slowed speech or poverty of speech
- Psychomotor disturbances – agitation or slowed movement
- Loss of efficiency completing tasks
- Loss of self esteem
- Concentration and memory problems
- Trouble making decisions
- Lack of motivation
- Thoughts of suicide or having a plan in place
How Depression Can Effect One’s Life
Left untreated, depression can lead to significant impairment in an individual’s ability to enjoy life. The effects of depression can range from minor annoyances to death. With proper interventions, depression can be treated and managed throughout the lifetime. The most common effects of depression can include
- Poor coping skills
- Pain especially headaches and stomach pain
- Sexual dysfunction
- Attempts to self-medicate with drugs or alcohol
- Decreased immune system functioning
- Family and marital problems
- Rejection at school or work
- Social isolation
- Premature death in medical conditions