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What is Hwabyeong and explain in detail?
Hwabyeong or Hwapyŏng (hangul: 화병, hanja: 火病) is a Korean somatization disorder, a mental illness which arises when people are unable to confront their anger as a result of conditions which they perceive to be unfair. Hwabyeong is known as a Korean culture-bound syndrome.
Hwabyeong is a colloquial name, and it refers to the etiology of the disorder rather than its symptoms or apparent characteristics. In one survey, 4.1% of the general population in a rural area in Korea were reported as having hwabyeong. Hwabyeong is similar to Amuk.
The word hwabyeong is composed of hwa (the Sino-Korean word 火 for "fire" which can also contextually mean "anger") and byeong (the Sino-Korean word 病 for "syndrome" or "illness"). It may also be called ulhwabyeong (鬱火病), literally "depression anger illness".

Symptoms
Physical symptoms include:

palpitations
anorexia
dry mouth
insomnia
thoracic/chest pressure
respiratory difficulties
epigastric mass
headache
a whole-body sensation of heat (distinct from heat intolerance, a symptom of hyperthyroidism)Psychological symptoms include:

being easily startled
externalization of anger, also known in Korean as "bun" (憤, "eruption of anger"), a Korean culture-related sentiment related to social unfairness
generally sad mood
frequent sighing
a feeling of "eok-ul" (抑鬱, [feeling of] unfairness)
being easily agitated
feelings of guilt
feelings of impending doomDiagnosed patients may also have a medical history of prior major depressive disorder, dysthymic disorder, anxiety disorders, somatoform disorders, or adjustment disorder according to the Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV) criteria.Diagnosed patients are most likely to be middle-aged, post-menopausal women with low socio-economic status.

Causes
Underlying causes may include:

amuk
prior instances of major depressive disorder
prior instances of anxiety disorder
prior instances of adjustment disorder
prior instances of other somatoform disorders
repression of feelings of anger/resentment arising from past eventsTriggering causes are typically external events, including:

familial stressors, e.g. spousal infidelity or conflict with in-laws
witnessing acts/actions/phenomena that conflict with ones own moral and/or ethical principlesThe syndrome itself is believed to be the result of the continued repression of feelings of anger without addressing their source. In holistic medicine the containment of anger in hwabyung disturbs the balance of the five bodily elements, resulting in the development of psychosomatic symptoms such as panic, insomnia, and depression after a long period of repressed feelings.
It is possible that hormonal imbalances such as those around the time of menopause may also be an underlying cause of hwabyung in middle-aged women, the most often-diagnosed demographic.

Treatment
Western doctors are more likely to diagnose it as a kind of stress or depression. The Diagnostic and Statistical Manual of Mental Disorders currently lists hwabyeong among its culture-bound illnesses. Outside of Korea, informally hwabyeong may be mistaken as a reference to a psychological profile marked by a short temper, or explosive, generally bellicose behavior. To the contrary, hwabyeong is a traditional psychological term used to refer to a condition characterized by passive suffering, is roughly comparable to depression, and is typically associated with older women