Yogis who have comprehended their spiritual nature claim that the soul, or the atom of consciousness, is located in the heart. Some of them have the ability to see the soul, others know about it from the Upanishads and ancient treatises on yoga. Our conscious "I", the subject of the experience we receive, is located in the region of the heart, and not in the brain, which is just a machine, or a computer that we use.
It is the presence of the soul, an inexhaustible source of energy , makes the heart muscle work constantly. The five streams of vital air, prana, or qi, as the Chinese call prana, also converge in the region of the heart. Being charged with the energy of the soul, they carry its consciousness through the nerve channels throughout the body. But even those who do not know this, introducing themselves to someone or showing themselves, put their hand on the heart, and not on the head or stomach.
I disagree with the first respondent in considering the dominant role of adrenaline in such processes. Everything is described correctly, but I will assume that the main reason for such "heaviness on the heart" is a lack of serotonin and oxytocin.
It has long been noticed that people suffering from severe forms of depression (lack of serotonin) begin to slouch, their respiratory changes rhythm, blood pressure.
Perhaps the effect of the hormone of happiness on organs such as the heart is still poorly understood. (in contrast to the large amount of data on the effect on the brain and intestines, for example). But the fact that serotonin is able to exert an effect on the function of cardiomyocytes is completely subject to the laws of logic, because it is known that it affects cells with similar tasks - intestinal cells responsible for the contraction of the walls.
Of course, I'm not a medic, but I'll try to briefly explain what I know. There is such a thing as the autonomic nervous system (this is still in school) - the automation of your body.
It is responsible for what different glands do, how the intestines work, how the heart beats and much more, which is consciously not controlled. It is closely related to the psyche.
During stress, experiences, a whole cocktail of different hormones is released into your bloodstream. Why does the pressure rise from excitement, the skin turns pale, the pupils dilate, and the heart beats more often? All this is done by adrenaline, it acts on special receptors (alpha and beta adrenergic receptors) in the cells of different organs. Adrenaline has a particularly strong effect on the heart. In cases of severe stress, panic attacks, people sometimes think that they are having a heart attack.
Such a close connection between the psyche and the autonomic system is necessary for life, these are protective reactions. The body must react to danger, injuries, etc., must be mobilized.
By the way, thequestion.ru has already asked this question
P.S. Perhaps I was inaccurate somewhere, I'm not a doctor after all.
Because compensating muscle pressure actually occurs there. These muscles constrain breathing and deprive the body of the flow of energy (if you force yourself to breathe deeper, the pressure will become stronger, dizzy and there will be a feeling of close loss of control over yourself, that is, the fear of going crazy).
When in Since the body has little energy, it becomes much easier to keep crying and tears, which you yourself consider to be a sign of madness. People often "calm down" each other, take away uncontrolled energy, and encourage greater tension in the chest. After all, when you are in pain, you need to behave calmly, as if everything is fine, and not torment others with your pain.