Breathing a little tight may be caused by physiological factors, but also may be caused by bronchitis, pneumonia and other pathological factors. 1. Physiological factors: strenuous exercise and lifting heavy objects will cause physical exertion, which will cause shortness of breath and a little tight breathing, which is a normal physiological situation, do not worry too much. 2. Pathological factors (1) Bronchitis: If the patient has recurrent bacterial infections, it will cause mutation of the bronchial mucosa and decrease of immunity, which may result in symptoms related to bronchitis. Bronchitis may be characterized by prolonged and recurrent coughing, as well as tightness of breath. (2) Pneumonia: Lung infections may cause increased respiratory secretions that block the airways, or further aggravation of the condition leading to respiratory failure, which may lead to tightness of breath. If breathing is a little tight, it can also be seen in bronchial asthma, allergic rhinitis and other causes, it is recommended to go to the hospital, under the guidance of the doctor to identify the cause of the disease, followed by follow-up treatment.