Bending down triggers coughing mostly in bronchitis, upper respiratory tract infections, but also may be a normal physiological reaction. Bronchitis and upper respiratory tract infection in the early stage, especially the elderly patients do not have obvious respiratory symptoms. When the bending position changes, the phlegm in the bronchial tube stimulates the mucous membrane of the throat and cough or cough aggravation occurs. At this time, you can go to the regular hospital to perform chest DR, blood routine and other tests to clarify the diagnosis. Treatment should drink more water, more rest, quit smoking, avoid the inhalation of harmful gases, oral phlegm drugs, such as ambroxol, bromhexine, etc., combined with infection can be oral penicillin or cephalosporin and other drugs. Bending over and coughing can also be seen in the normal physiological response. When bending over due to increased intra-abdominal pressure, so that the diaphragm upward, the lungs are squeezed and coughing, to restore the position of the symptoms will be relieved. There may be other reasons for coughing when bending over. If the cough persists without relief or is accompanied by other discomforts, it is recommended to go to the hospital and be evaluated by a specialist for diagnosis and treatment. The above medications should be used under the supervision of a physician.