Feeling tired of breathing, also called labored breathing, is a more subjective symptom that can manifest as dyspnea or dyspnea. There are many causes, including infectious and non-infectious diseases of the respiratory tract, such as the common cold, acute pharyngitis, acute tonsillitis, acute epiglottitis, and laryngeal ulcers, all of which can cause the symptoms of feeling breathless and tired of breathing. There are also some serious lung diseases, such as severe pneumonia, persistent bronchial asthma, chronic obstructive pulmonary disease, or having chronic cardiac insufficiency, pulmonary embolism, or pulmonary atelectasis, which can cause labored breathing and feeling tired of breathing. Therefore, if you feel tired of breathing for a long time, you should improve the lung CT, cardiac ultrasound and other related examinations in time to clarify.