Breathing at night with rumbling during the day may be the cause of bronchitis, bronchial asthma, cardiac insufficiency, etc., according to the different causes, to take different treatments. 1. Bronchitis: due to the inflammation caused by airway secretion increase, blocking the airway and cause croup, can apply antibacterial drug treatment. Bacteria can be treated with penicillin, cephalosporins, fluoroquinolones and other drugs; viruses can be treated with antiviral drugs such as ribavirin; mycoplasma and chlamydia can be treated with macrolides such as clarithromycin and azithromycin. 2. Bronchial asthma: Early manifestation is serious at night, rales can appear, and improve during the day. It can be treated with glucocorticoids, β2 agonists such as salbutamol, and desensitization. 3. Cardiac insufficiency: Croup may occur at night when the volume of returned blood increases while lying down and the burden on the heart increases. It can be treated with rest, lifestyle modification and diuretics such as furosemide and angiotensin-converting enzyme inhibitors such as captopril. There may be other reasons for the croup at night and during the day, so it is recommended that you go to the hospital in time to find out the cause of the croup and get targeted treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.