(I)For most of us, no matter how healthy, occasional pain is an inevitable part of life. (II) There are many types of pain, ranging from the sharp pin-prick variety through to the more deep-seated dull ache. (III)Although often extremely unpleasant at the time, there is a good reason why we experience this - discomfort. (IV)Pain is our body's way of letting us know that something is wrong. (V)This early warning signal gives us chance to judge how severe the condition is, and to decide if it's necessary, to consult a doctor.