In psychology, frustration<span> is a common </span>emotional<span> response to opposition.
Related to </span>anger<span> and </span>disappointment<span>, frustration arises from the perceived resistance to the fulfilment of an individual's </span>will<span> or goal </span><span>and is likely to increase when a will or goal is denied or blocked.
There are two types of frustration; internal and external. Internal frustration may arise from challenges in fulfilling </span>personal goals<span>, </span>desires<span>, instinctual drives and needs, or dealing with perceived </span>deficiencies<span>, such as a lack of </span>confidence<span> or </span>fear<span> of social situations.
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Conflict<span>, such as when one has competing goals that interfere with one another, can also be an internal source of frustration and can create </span>cognitive dissonance<span>.
External causes of frustration involve conditions outside of an individual's control, such as a physical roadblock, a difficult task, or the perception of wasting time.
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Not sure check on yahoo answers
<span>Once you make a career choice, it should never be changed.
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Head injury, as your head is your skull, damaging your skull is very serious as your brain is located there and damaging your brain could probably kill or limit some abilities