Depression (mood)

depressiondepressedmelancholydespairdepressivemelancholicdepressed moodhopelessnessdepressive symptomspsychological depression
Depression is a state of low mood and aversion to activity.wikipedia
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Major depressive disorder

depressionclinical depressionmajor depression
Depressed mood is a symptom of some mood disorders such as major depressive disorder or dysthymia; it is a normal temporary reaction to life events, such as the loss of a loved one; and it is also a symptom of some physical diseases and a side effect of some drugs and medical treatments. These include major depressive disorder (MDD; commonly called major depression or clinical depression) where a person has at least two weeks of depressed mood or a loss of interest or pleasure in nearly all activities; and dysthymia, a state of chronic depressed mood, the symptoms of which do not meet the severity of a major depressive episode.
Major depressive disorder (MDD), also known simply as depression, is a mental disorder characterized by at least two weeks of low mood that is present across most situations.

Grief

bereavementgrievingloss
Adversity in childhood, such as bereavement, neglect, mental abuse, physical abuse, sexual abuse, and unequal parental treatment of siblings can contribute to depression in adulthood.
This focuses on the anxiety, depression, somatic concerns, traumatic responses, familial relationships, interpersonal relationships, self-esteem, meaning structure, work, and investment in life tasks.

Child sexual abuse

child molestationchild molestermolested
Adversity in childhood, such as bereavement, neglect, mental abuse, physical abuse, sexual abuse, and unequal parental treatment of siblings can contribute to depression in adulthood.
The effects of child sexual abuse can include depression, post-traumatic stress disorder, anxiety, complex post-traumatic stress disorder, propensity to further victimization in adulthood, and physical injury to the child, among other problems.

Mood (psychology)

moodmoodsatmosphere
Depression is a state of low mood and aversion to activity.
Negative moods have been connected with depression, anxiety, aggression, poor self-esteem, physiological stress and decrease in sexual arousal.

Neuroticism

neuroticneuroticallyadult neurotic
High scores on the personality domain neuroticism make the development of depressive symptoms as well as all kinds of depression diagnoses more likely, and depression is associated with low extraversion.
Individuals who score high on neuroticism are more likely than average to be moody and to experience such feelings as anxiety, worry, fear, anger, frustration, envy, jealousy, guilt, depressed mood, and loneliness.

Bullying

bullybulliedbullies
Life events and changes that may influence depressed moods include (but are not limited to): childbirth, menopause, financial difficulties, unemployment, stress (such as from work, education, family, living conditions etc.), a medical diagnosis (cancer, HIV, etc.), bullying, loss of a loved one, natural disasters, social isolation, rape, relationship troubles, jealousy, separation, and catastrophic injury.
Bullying can cause loneliness, depression, anxiety, lead to low self-esteem and increased susceptibility to illness.

Isotretinoin

Accutane13-cis retinoic acidRoaccutane
Therapies associated with depression include interferon therapy, beta-blockers, isotretinoin, contraceptives, cardiac agents, anticonvulsants, antimigraine drugs, antipsychotics, and hormonal agents such as gonadotropin-releasing hormone agonist.

Subjective well-being

tripartite model of subjective well-beingsubjective wellbeingemotional wellbeing
It can affect a person's thoughts, behavior, motivation, feelings, and sense of well-being.
Conversely, a number of studies found that baseline depression predicted poorer longer-term health status and mortality.

Neglect

parental neglectchild neglectignorance
Adversity in childhood, such as bereavement, neglect, mental abuse, physical abuse, sexual abuse, and unequal parental treatment of siblings can contribute to depression in adulthood.
Studies of neglected children show heightened levels of depression and hopelessness, and higher incidents of suicide attempts.

Hypothyroidism

hypothyroidhypo-underactive thyroid
Depressed mood can be the result of a number of infectious diseases, nutritional deficiencies, neurological conditions and physiological problems, including hypoandrogenism (in men), Addison's disease, Cushing's syndrome, hypothyroidism, Lyme disease, multiple sclerosis, Parkinson's disease, chronic pain, stroke, diabetes, and cancer.
It can cause a number of symptoms, such as poor ability to tolerate cold, a feeling of tiredness, constipation, depression, and weight gain.

Dysthymia

chronic depressiondysthymic disorderdysthymic
Depressed mood is a symptom of some mood disorders such as major depressive disorder or dysthymia; it is a normal temporary reaction to life events, such as the loss of a loved one; and it is also a symptom of some physical diseases and a side effect of some drugs and medical treatments. These include major depressive disorder (MDD; commonly called major depression or clinical depression) where a person has at least two weeks of depressed mood or a loss of interest or pleasure in nearly all activities; and dysthymia, a state of chronic depressed mood, the symptoms of which do not meet the severity of a major depressive episode.

Major depressive episode

depressive episodedepressionmajor depressive episodes
These include major depressive disorder (MDD; commonly called major depression or clinical depression) where a person has at least two weeks of depressed mood or a loss of interest or pleasure in nearly all activities; and dysthymia, a state of chronic depressed mood, the symptoms of which do not meet the severity of a major depressive episode.
Sufferers primarily have a depressed mood for two weeks or more, and a loss of interest or pleasure in everyday activities, accompanied by other symptoms such as feelings of emptiness, hopelessness, anxiety, worthlessness, guilt and irritability, changes in appetite, problems concentrating, remembering details or making decisions, and thoughts of suicide.

Bipolar disorder

bipolarmanic depressionmanic depressive
Another mood disorder, bipolar disorder, features one or more episodes of abnormally elevated mood, cognition and energy levels, but may also involve one or more episodes of depression.
Bipolar disorder, previously known as manic depression, is a mental disorder that causes periods of depression and abnormally elevated moods.

Catastrophic injury

catastrophic injuriescatastrophiccatastrophe
Life events and changes that may influence depressed moods include (but are not limited to): childbirth, menopause, financial difficulties, unemployment, stress (such as from work, education, family, living conditions etc.), a medical diagnosis (cancer, HIV, etc.), bullying, loss of a loved one, natural disasters, social isolation, rape, relationship troubles, jealousy, separation, and catastrophic injury.
The most common initial response is depression.

Social rejection

rejectionsocial ostracismrejection sensitivity
Adolescents may be especially prone to experiencing depressed mood following social rejection, peer pressure, or bullying.
Subjectively, rejected individuals experience a range of negative emotions, including frustration, intense anger, jealousy, hate, and eventually, resignation, despair, and possible long-term depression.

Androgen deficiency

hypoandrogenismlow testosterone levelsandrogen deprivation
Depressed mood can be the result of a number of infectious diseases, nutritional deficiencies, neurological conditions and physiological problems, including hypoandrogenism (in men), Addison's disease, Cushing's syndrome, hypothyroidism, Lyme disease, multiple sclerosis, Parkinson's disease, chronic pain, stroke, diabetes, and cancer.
Symptoms of the condition in males consist of loss of libido, impotence, infertility, shrinkage of the testicles, penis, and prostate, diminished masculinization (e.g., decreased facial and body hair growth), low muscle mass, anxiety, depression, fatigue, vasomotor symptoms (hot flashes), insomnia, headaches, and osteoporosis.

Seasonal affective disorder

winter bluesseasonal depressionSAD
When the course of depressive episodes follows a seasonal pattern, the disorder (major depressive disorder, bipolar disorder, etc.) may be described as a seasonal affective disorder.
Seasonal affective disorder (SAD) is a mood disorder subset in which people who have normal mental health throughout most of the year exhibit depressive symptoms at the same time each year, most commonly in winter.

Parkinson's disease

ParkinsonParkinson’s diseaseParkinson disease
Depressed mood can be the result of a number of infectious diseases, nutritional deficiencies, neurological conditions and physiological problems, including hypoandrogenism (in men), Addison's disease, Cushing's syndrome, hypothyroidism, Lyme disease, multiple sclerosis, Parkinson's disease, chronic pain, stroke, diabetes, and cancer.
The most frequent mood difficulties are depression, apathy, and anxiety.

Borderline personality disorder

borderlineborderline personalityemotional instability
Outside the mood disorders: borderline personality disorder often features an extremely intense depressive mood; adjustment disorder with depressed mood is a mood disturbance appearing as a psychological response to an identifiable event or stressor, in which the resulting emotional or behavioral symptoms are significant but do not meet the criteria for a major depressive episode; and posttraumatic stress disorder, a mental disorder that sometimes follows trauma, is commonly accompanied by depressed mood.
Substance abuse, depression, and eating disorders are commonly associated with BPD.

Lyme disease

borreliosisLyme borreliosisLyme
Depressed mood can be the result of a number of infectious diseases, nutritional deficiencies, neurological conditions and physiological problems, including hypoandrogenism (in men), Addison's disease, Cushing's syndrome, hypothyroidism, Lyme disease, multiple sclerosis, Parkinson's disease, chronic pain, stroke, diabetes, and cancer.
However, problems such as depression and fibromyalgia are as common in people with Lyme disease as in the general population.

Sedative

sedativessedative-hypnoticsedated
These include alcohol, sedatives (including prescription benzodiazepines), opioids (including prescription pain killers and illicit drugs such as heroin), stimulants (such as cocaine and amphetamines), hallucinogens, and inhalants.
The paradoxical reactions may consist of depression, with or without suicidal tendencies, phobias, aggressiveness, violent behavior and symptoms sometimes misdiagnosed as psychosis.

Adjustment disorder

adjustment disordersreactive depressionadjustment disorder with depressed mood
Outside the mood disorders: borderline personality disorder often features an extremely intense depressive mood; adjustment disorder with depressed mood is a mood disturbance appearing as a psychological response to an identifiable event or stressor, in which the resulting emotional or behavioral symptoms are significant but do not meet the criteria for a major depressive episode; and posttraumatic stress disorder, a mental disorder that sometimes follows trauma, is commonly accompanied by depressed mood.
According to the DSM-5, there are six types of AjD, which are characterized by the following predominant symptoms: depressed mood, anxiety, mixed depression and anxiety, disturbance of conduct, mixed disturbance of emotions and conduct, and unspecified.

Mental health

behavioral healthmentalmental hygiene
In order to capture a day-to-day observation of the relationship between the damaging effects of social abuse, the victim's mental health and depressive mood, a study was conducted on whether individuals would have a higher level of depressed mood when exposed to daily acts of negative behavior.
Mental health problems may arise due to stress, loneliness, depression, anxiety, relationship problems, death of a loved one, suicidal thoughts, grief, addiction, ADHD, self-harm, various mood disorders, or other mental illnesses of varying degrees, as well as learning disabilities.

Patient Health Questionnaire

PRIME-MDPatient Health Questionnaire (PHQ)Patient Health Questionnaire 9
Measures of depression as an emotional disorder include, but are not limited to: Beck Depression Inventory-11 and the 9-item depression scale in the Patient Health Questionnaire.
The Patient Health Questionnaire (PHQ) is a multiple-choice self-report inventory copyrighted by Pfizer Inc, that is used as a screening and diagnostic tool for mental health disorders of depression, anxiety, alcohol, eating, and somatoform disorders.

Substituted amphetamine

amphetaminesamphetaminesubstituted amphetamines
These include alcohol, sedatives (including prescription benzodiazepines), opioids (including prescription pain killers and illicit drugs such as heroin), stimulants (such as cocaine and amphetamines), hallucinogens, and inhalants.
During World War II, amphetamines were used by the German military to keep their tank crews awake for long periods, and treat depression.