Signs and symptoms of mental illness can vary, depending on the disorder, circumstances and other factors. Mental illness symptoms can affect emotions, thoughts and behaviors.
Examples of signs and symptoms include:
Feeling sad or down.
Confused thinking or reduced ability to concentrate.
Excessive fears or worries, or extreme feelings of guilt.
Extreme mood changes of highs and lows.
Withdrawal from friends and activities.
Significant tiredness, low energy or problems sleeping.
Detachment from reality (delusions), paranoia or hallucinations.
Inability to cope with daily problems or stress.
Trouble understanding and relating to situations and to people.
Problems with alcohol or drug use.
Major changes in eating habits.
Sex drive changes.
Excessive anger, hostility or violence.
Suicidal thinking.
精神疾病的体征和症状可能会有所不同，具体取决于疾病、环境和其他因素。精神疾病症状会影响情绪、思想和行为。
体征和症状的例子包括：
感到悲伤或沮丧
思维混乱或注意力不集中
过度恐惧或担忧，或极度内疚
高潮和低谷的极端情绪变化
退出朋友和活动
明显疲倦、精力不足或睡眠问题
脱离现实（妄想）、偏执或幻觉
无法应对日常问题或压力
对情况和人的理解和关联有困难
酒精或药物使用问题
饮食习惯的重大改变
性欲改变
过度愤怒、敌意或暴力
自杀念头
