What is the reason why I feel short of breath when writing Chinese calligraphy?

Chest tightness is often considered as "holding your breath". It's a subjective feeling, that is, breathing difficulties or breathlessness. Light as if nothing had happened, heavy feeling uncomfortable, as if being pressed by a stone in the chest, and even breathing difficulties. It may be the functional manifestation of body organs, or it may be one of the earliest symptoms of human diseases. People of different ages have different causes and treatments for chest tightness. 1. Functional chest tightness (chest tightness without organic lesions) People will feel chest tightness and fatigue if they stay in a room with closed doors and windows and no air circulation for a long time, or in a climate with low air pressure, or encounter some unpleasant things, or even have an argument with others. After a short rest, open the window for ventilation or breathe fresh air outdoors, you can relax and adjust your mood and will soon return to normal. Chest tightness like this can be said to be functional chest tightness, which does not require tension or treatment. 2. Pathological chest tightness (chest tightness with organic lesions) Chest tightness can be not only physiological, but also caused by diseases of some organs in the body, that is, pathological chest tightness. For example, airway obstruction-intratracheal and bronchial tumors, tracheal stenosis, tracheal external pressure (goiter, mediastinal tumors); Lung diseases-emphysema, bronchitis, asthma, atelectasis, pulmonary infarction, pneumothorax; Heart disease-some congenital heart diseases, rheumatic valvular heart disease, coronary heart disease, heart tumors; Diaphragm diseases-diaphragm swelling, diaphragm paralysis; Humoral metabolism and acid-base imbalance. Pathological chest tightness can occur suddenly or slowly. Sudden attacks are mostly caused by acute traumatic or spontaneous pneumothorax, acute asthma, acute tracheal foreign body, acute heart attack, acute lung infarction, etc. Slow chest tightness is that with the extension of the course of the disease, the symptoms gradually worsen. Chest tightness in children often suggests congenital heart disease or mediastinal tumor; Chest tightness in young people often suggests spontaneous pneumothorax, mediastinal tumor and rheumatic valvular heart disease. Chest tightness in the elderly mostly suggests emphysema and coronary heart disease. In short, we must pay attention to pathological chest tightness so as not to delay the necessary treatment. Patients should go to the hospital in time for chest X-ray, electrocardiogram, echocardiography, blood biochemical examination and pulmonary function determination, so that clinicians can make further diagnosis. People with chest tightness should not ignore it. Only by correct treatment can we get timely diagnosis and reasonable treatment.