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.
Since Hwabyeong can often be misdiagnosed as depression, the symptoms and culture need to be clearly and thoroughly looked into. Once Hwabyeong has been diagnosed, past treatments need to be reviewed. The treatments for the patient can then be a combination of pharmacological, and therapy-based interventions. The treatment methods used to combat hwabyung include psychotherapy, drug treatment, family therapy, and community approaches. To be more successful psychiatrists might need to incorporate the teachings from traditional and religious healing methods or the use of han-puri, which is the sentiment of resolving, loosening, unraveling and appeasing negative emotions with positive ones. One example of hann-puri would be a mother who has suffered from poverty, less education, a violent husband, or a harsh mother-in-law, can be solved many years later by the success of her son for which she had endured hardships and sacrifices. See also
Ataque de nervios
Anger
Repression

References
Further reading
Examining Anger in Culture-Bound Syndromes Psychiatric Times
Korean Womens Causal Perceptions of Hwabyung
Hwabyung: the construction of a Korean popular illness among Korean elderly immigrant women in the United States
Symptoms of Hwabyeong (in Korean)
Sung Kil Min, Shin-Young Suh, Ki-Jun Song (2009). Symptoms to use for Diagnostic Criteria of Hwa-Byung, an Anger Syndrome. Psychiatry Investig. 2009 March; 6(1): 7–12. Published online 2009 March 31.doi:  10.4306/pi.2009.6.1.7
Hwa-byung: Culture-related Syndrome
Hwabyung in Korea: Culture and Dynamic Analysis