Persistent sadness is one of the hallmark traits of depression. In addition, thoughts of suicide may be common, according to the Anxiety and Depression Association of America. \n\nNeed help? In the U.S., call 1-800-273-8255 for the National Suicide Prevention Lifeline. (credit:m-imagephotography via Getty Images)
睡眠障害(02 of07)
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Sleeping too much, or not getting enough sleep, are both potential symptoms of depression, according to the Mayo Clinic. The National Institute of Mental Health also points out that people with depression may also experience night-time awakenings, where they feel their minds are racing and they feel overwhelmed with problems they must solve. Alternately, some people are able to sleep, but never actually feel rested from said sleep. (credit:BernardaSv via Getty Images)
食欲の変化(減ることも過食することもある)(03 of07)
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Depression can affect how hungry people feel — sometimes making them eat more, sometimes making them eat less, according to the National Alliance on Mental Illness. For the latter, the appetite changes can also lead to weight loss. (credit:Peter Cade via Getty Images)
気力の低下(04 of07)
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People with depression may feel like they don’t have the mental energy needed to get through the day, and may even feel like they’re responding to things more slowly, according to the National Alliance on Mental Illness. They may also experience a loss of focus -- such as having trouble concentrating on a TV show or newspaper article. (credit:Monkey Business Images via Getty Images)
頭痛や胃痛などの身体的症状(05 of07)
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Depression may be most well-known for its mental symptoms, but the condition can also present an array of physical symptoms, including stomach aches, headaches and chest tightness, according to the National Institute of Mental Health. (credit:stevanovicigor via Getty Images)
絶望、罪悪感、過去へのこだわり(06 of07)
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People with depression may feel a sense of hopelessness and pessimism, as well as guilt/fault for past failures (even if they are not to blame). (credit:evgenyatamanenko via Getty Images)
これまで関心が持てたことに関心が持てなくなる(07 of07)
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Losing interest in things that once brought joy is a symptom of depression. Hobbies, loved ones -- even sex -- can lose their appeal, according to the National Institute of Mental Health. (credit:beyond foto via Getty Images)