Pain is a symptom of the disease. Accompanied by a feeling of fear and danger to life, it is undoubtedly the most unpleasant experience for a person. Because of this, man expanded the notion of pain to denote severe grief and suffering. Pain accompanies a man all his life. Birth is accompanied by pain, death is often preceded by pain, the whole life is filled with periods of occasional pain. And the word disease in our language comes from the word pain, which has always been considered the basic sign of disease. Nevertheless, pain is an ally of man: it warns of the dangers that threaten the body and occurs whenever the tissue is damaged. A person reacts to pain involuntarily to remove the cause that caused the damage, e.g., when we sit on a hot object, the pain would force us to get up. If we lay in only one position of the body for too long, the pain would force us to turn around, and by changing the position of the body we prevent damage caused by insufficient blood circulation in the skin due to prolonged pressure. Pain inside the body forces the patient to seek medical attention. Many people survived only because the pain announced a serious illness in a timely manner and thus enabled emergency medical care. Pain most often forces the patient to seek medical attention. The intensity of the pain does not correspond to the degree of danger. Innocent toothache can be the cause of unbearable pain, while stomach cancer at the beginning of the disease does not hurt at all and causes slight disturbances. The doctor, knowing the types and ways of spreading pain, can diagnose the disease on the basis of that single sign of the disease.

Pain is a special, independent type of sensation, such as a separate sensation of heat, cold, and touch. There are appropriate sensory bodies for the sensation of pain. These are very sensitive nerve endings located in the skin and inside the body. Stimuli are transmitted by nerve fibers to a part of the brain called the thalamus, which is a very important center of the nervous system. There are centers of the autonomic nervous system that manages involuntary, but for human life important functions of certain organs, glands, etc. With the help of this system a number of changes occur on the surface and inside the body that regularly accompany any severe pain. This causes the pupils to dilate, the blood vessels to constrict and the blood pressure to rise, sweating and the blood sugar to rise. In this part of the brain, the type of pain and the location of the pain in the part of the body where the stimulus occurred are determined. Everything about pain in animals ends here, in the midbrain. Only in man do the nerve fibers go to the cerebral cortex, where the seat of mental life is. It is only in the cerebral cortex that pain acquires characteristics characteristic of man. Here the pain is not given a tangible but a sensory basis of suffering, anxiety, depression and fear. This mental, psychic, reaction to pain is peculiar only to man. Since man feels everything in his own way, so every man experiences pain in his own way. This is why pain is called a personal, subjective feeling.

These are the reasons why there are big differences between people in the way they experience pain and how they react to it. Men tolerate pain more easily than women, adults more easily than children. Older people find it harder to bear than middle-aged people. Native Americans tolerate pain more easily than other races. Sensitivity to pain also changes in the same person at different times. Fatigue, fear and excitement intensify the sensation of pain. Fear of injection intensifies the sensation of pain when the needle is inserted. Health fears, which often accompany illness, increase sensitivity to pain. Just as a person reacts differently in different life circumstances, he reacts differently to pain. Individuals who feared toothache heroically endured the pain of torture. A person can feel pain in different parts of the body without real reasons. It is imaginary pain or nerve-based pain, neurotic or psychoneurotic pain. There is no physical basis for imaginary pain. The parts of the body where the pain is felt are not changed, they are healthy. Pain signals do not travel through nerves to the brain because there is no stimulus that would cause pain. In such persons there are only psychological changes. The image of pain is created in the brain without the appropriate stimulus for pain. Such pain is perceived by a person as real, and the accompanying reactions are similar, often more pronounced than during the actual sensation of pain. In such people there is a feeling of suffering, fear of a dangerous disease, which makes crying alleviate ailments. They describe their pain theatrically, not only to their doctor but also to friends, neighbors, and often complete strangers.

The place where they place their pain depends on their own image they have in their body. These are most often headaches or pain in the heart area, but any part of the body, arms, legs, joints, lower back, face, internal parts, and even organs that are completely insensitive to pain can hurt. It is characteristic of imaginary pain to travel through the body from one place to another. Sometimes there is a headache, so that there are pains in the joints, spine, eyes, heart. Some feel the pain as pressure, squeezing, screwing, others will describe it as stabbing, stabbing, cutting or driving a wedge. Patients with imaginary pain are the most frequent visitors to outpatient clinics. It is very difficult to convince them that everything is fine with their body. They are distrustful and go from doctor to doctor. They also go to quacks, herbalists and sorcerers, asking for help for their unbearable pain. How many times do they spend large sums of money on examinations and medicines, and that leads them to material impoverishment. Psychogenic pain can also occur in those people who are mentally and mentally completely healthy. Problems at work, marital conflicts and the like cause short-term sensations of pain most often in the area of ​​the heart and head. By solving the problem, the pain stops on its own. If crisis situations are long lasting, if there are a number of unsolvable problems, the treatment of such patients can take a long time. The doctor will first rule out the possibility that the pain does not originate from the disease. Patients undergo numerous examinations and tests. The possibility that the pain they feel may also originate from a more dangerous disease is just one of the reasons why it is very difficult to convince such patients that they are physically healthy and that their pain is only imaginary.