The term 'pain' refers to the unpleasant feeling, which may vary to a considerable degree. This sensation may be more or less pronounced, from an attack of pain to a constant dull feeling. Pain can be transitory, when related to damages and injuries,or chronic when related to certain diseases and conditions. In some cases it is well bearable, while sometimes pain completely drains out strength and energy.

The character of pain depends on two factors. The first is the place of injury. The second is the way our brain processes signals of the nerve system. Various analgesics affect the processes in the brain or prevent the transfer of pain signals from the injured area. The threshold of pain sensitivity and the ability to stand pain is very different. Moreover, the way analgesics influence the degree of pain also varies considerably.

This is why any analgesic should be chosen not only with regard to a concrete problem but also for a particular person. An over-the-counter drug may work perfectly for a strained tendon. But some people do need more powerful medications to overcome pain in this case. It is the person, not the damage or the disease, that determines the right approach to pain.