Sadness

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  Happiness

  Happiness is a state of mind or feeling characterized by contentment, love, satisfaction, pleasure, or joy. A variety of philosophical, religious, psychological and biological approaches have striven to define happiness and identify its sources. Philosophers and religious thinkers often define...
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  Insomnia

  Insomnia is a symptom of any of several sleep disorders, characterized by persistent difficulty falling asleep or staying asleep despite the opportunity. Insomnia is a symptom, not a stand-alone diagnosis or a disease. By definition, insomnia is "difficulty initiating or maintaining sleep, or both"...
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  Anxiety

  Anxiety is a psychological and physiological state characterized by cognitive, somatic, emotional, and behavioral components. These components combine to create an unpleasant feeling that is typically associated with uneasiness, fear, or worry. Anxiety is a generalized mood condition that occurs...
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  Hunger

  Hunger is a feeling experienced when one has a desire to eat. Satiety is the absence of hunger. The often unpleasant feeling of hunger originates from the hypothalamus releasing hormones that target receptors in the liver. Although an average nourished individual can survive weeks without food...
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  Psychosis

  Psychosis (from the Greek ψυχή "psyche", for mind or soul, and -ωσις "-osis", for abnormal condition) literally means abnormal condition of the mind, and is a generic psychiatric term for a mental state often described as involving a "loss of contact with reality". People suffering from psychosis...
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  Aggression

  In psychology, as well as other social and behavioral sciences, aggression refers to behavior between members of the same species that is intended to cause pain or harm. Predatory or defensive behavior between members of different species is not normally considered "aggression." Aggression takes a...
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  Anger

  Anger is an emotion. The physical effects of anger include increased heart rate, blood pressure, and levels of adrenaline and noradrenaline. Some view anger as part of the fight or flight brain response to the perceived threat of harm. Anger becomes the predominant feeling behaviorally, cognitively...

• Apathy

  Apathy (also called impassivity or perfunctoriness) is a state of indifference, or the suppression of emotions such as concern, excitement, motivation and passion. An apathetic individual has an absence of interest or concern to emotional, social, or physical life. They may also exhibit an...

• Irritability

  Irritability is an excessive response to stimuli. The term is used for both the physiological reaction to stimuli and for the pathological, abnormal or excessive sensitivity to stimuli. Irritability may be demonstrated in behavioral responses to both physiological and behavioral stimuli including...