The condition is medically called dyspnea, and the causes of dyspnea are mainly related to the heart and lungs. Common heart diseases, such as heart attack and heart failure, can cause dyspnea. Lung diseases such as bronchial asthma, chronic obstructive pulmonary disease and interstitial pneumonia can also cause breathlessness. Systemic diseases, such as anemia, chronic renal insufficiency, and cirrhosis of the liver can also cause chest tightness. Poisoning, such as eating pesticides or mistakenly consuming poison, can also cause chest tightness. The last kind is mental and psychological diseases, such as some depression patients, psychiatric patients, can often appear chest tightness, can not breathe, but the organ itself is not a problem.