Weakness, chest tightness and shortness of breath, and always want to sleep, need to pay attention to the following aspects of the problem: 1, heart-related diseases. The most common is heart failure, where the amount of blood from the heart to the aorta decreases, resulting in insufficient blood and oxygen supply to the whole body, causing pulmonary stasis. 2, respiratory system diseases. The most common is chronic obstructive pulmonary disease, which affects the gas exchange in the lungs and also causes different degrees of hypoxemia, causing the occurrence of the above symptoms. 3, blood system diseases. The most common one is anemia. Anemic patients have reduced hemoglobin content and the body’s ability to transport oxygen, which can also cause insufficient oxygen supply to various organs, resulting in the above-mentioned symptoms such as chest tightness, etc. Blood tests and bone marrow aspiration can help clarify the diagnosis.