The notion of emotional security of an individual is to be distinguished from that of emotional safety or security provided by a non-threatening, supportive environment. A person who is susceptible to bouts of depression being triggered by minor setbacks is said to be less "emotionally secure". A person whose general happiness is not very shaken even by major disturbances in the pattern or fabric of their life might be said to be extremely emotionally secure. Anxiety is a feeling of nervousness, apprehension, fear, or worry. Some fears and worries are justified, such as worry about a loved one. Problem anxiety interferes with the sufferer's ability to sleep or otherwise function. It is noteworthy that teenagers are particularly susceptible to having irritability as a symptom of a number of emotional problems, including anxiety. Severe anxiety can have a serious impact on daily life. But our love is more than that.