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Depression is a serious disorder. I sometimes get sad a lot. If affects mood, thoughts, behavior, etc.
Depression is a state of low mood and aversion to activity that can affect a person's thoughts, behavior, feelings, and sense of well-being.
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Depression (mood)
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Major depressive disorder
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. It is often accompanied by low self-esteem, loss of interest in normally enjoyable activities, low energy, and pain without a clear cause. People may also occasionally have false beliefs or see or hear things that others cannot. Some people have periods of depression separated by years in which they are normal while others nearly always have symptoms present. Major depressive disorder can negatively affect a person's personal, work, or school life, as well as sleeping, eating habits, and general health.
Mental disorder
A mental disorder, also called a mental illness or psychiatric disorder, is a behavioral or mental pattern that causes significant distress or impairment of personal functioning. Such features may be persistent, relapsing and remitting, or occur as a single episode. Many disorders have been described, with signs and symptoms that vary widely between specific disorders. Such disorders may be diagnosed by a mental health professional. The causes of mental disorders are often unclear. Theories may incorporate findings from a range of fields. Mental disorders are usually defined by a combination of how a person behaves, feels, perceives, or thinks.
Borderline personality disorder
Borderline personality disorder (BPD), also known as emotionally unstable personality disorder (EUPD), is a long-term pattern of abnormal behavior characterized by unstable relationships with other people, unstable sense of self, and unstable emotions. There is frequent dangerous behavior and self-harm. People may also struggle with a feeling of emptiness and a fear of abandonment. Symptoms may be brought on by seemingly normal events. The behavior typically begins by early adulthood, and occurs across a variety of situations. Substance abuse, depression, and eating disorders are commonly associated with BPD.
Separation anxiety disorder
Separation anxiety disorder (SAD), is an anxiety disorder in which an individual experiences excessive anxiety regarding separation from home or from people to whom the individual has a strong emotional attachment (e.g., a parent, caregiver, significant other or siblings). It is most common in infants and small children, typically between the ages of 6–7 months to 3 years, although it may pathologically manifest itself in older children, adolescents and adults. Separation anxiety is a natural part of the developmental process. Unlike SAD (indicated by excessive anxiety), normal separation anxiety indicates healthy advancements in a child's cognitive maturation and should not be considered a developing behavioral problem.
Epigenetics of depression
Depression is a serious behavioral disorder causing long lasting feelings of sadness and loss of interest. One form of depression is Major Depressive Disorder (MDD), in which symptoms of depression are present most days a week for 2 weeks or longer. Depression affects a large aspect of day-to-day activities such as thought process, sleep, and appetite. It can be accompanied by anxiety and decreased energy. According to the World Health Organization, depression affects about 350 million people worldwide and is the major cause of disability. Depression can be caused by the interaction of environmental and genetic factors.
Bipolar disorder
Bipolar disorder, previously known as manic depression, is a mental disorder that causes periods of depression and periods of elevated mood. The elevated mood is significant and is known as mania or hypomania, depending on its severity, or whether symptoms of psychosis are present. During mania, an individual behaves or feels abnormally energetic, happy, or irritable. Individuals often make poorly thought out decisions with little regard to the consequences. The need for sleep is usually reduced during manic phases. During periods of depression, there may be crying, a negative outlook on life, and poor eye contact with others.
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 the winter. People may sleep too much or have little energy. The condition in the summer can include heightened anxiety. In the "Diagnostic and Statistical Manual of Mental Disorders" DSM-IV and DSM-5, its status was changed. It is no longer classified as a unique mood disorder but is now a specifier, called "with seasonal pattern", for recurrent major depressive disorder that occurs at a specific time of the year and fully remits otherwise.