Cough has been bad with clear sputum may be due to colds, cough variant asthma, bronchitis and other reasons, usually by way of medication. 1. Colds: Colds are usually caused by viral infections, and often present with symptoms such as nasal congestion, runny nose, cough, and coughing up clear sputum or white sputum. Coughing, coughing and white phlegm are the symptoms of colds, which are usually treated with cough suppressants such as Ambroxol and Bromhexine. If the cold is caused by influenza virus, antiviral drugs such as ribavirin and oseltamivir can be used. 2. Cough variant asthma: Cough variant asthma is often characterized by irritating cough, mainly dry cough, but also can be manifested as coughing clear sputum. Inhaled glucocorticosteroids combined with adrenergic receptor antagonists, such as budesonide formoterol powder inhaler, are usually used for treatment. 3. Bronchitis: Bronchitis will have an increase in bronchial secretions, causing the patient to cough, cough sputum symptoms. The treatment usually adopts the symptomatic supportive therapy such as Ambroxol and Bromhexine. If the bronchitis is caused by allergies, antihistamines such as cetirizine and loratadine can be used. A persistent cough with clear phlegm may also be caused by other diseases. If the symptoms do not improve or worsen, it is recommended to consult a doctor in time to clarify the cause of the disease, and use medication under the guidance of the doctor.