Thin sputum, considering the respiratory tract or lung inflammation and infection, allergies and other factors, need to cause and symptomatic drug treatment, sputum is not easy to cough out the sputum, but also need to suction to assist sputum expectoration. 1. Treatment of the cause: on the one hand, according to the cause of the choice of drugs, such as bacterial infection caused by cough sputum thin, can use penicillin or cephalosporin antibiotics; allergic factors caused by the use of antihistamines, such as diclofenac tartaridine, cetirizine, loratadine and so on. 2. Symptomatic treatment, choose some drugs to resolve phlegm, such as acetylcysteine, aminoglutethimide hydrochloride oral solution, etc., can promote phlegm discharge. You can also use nebulized drugs, such as acetylcysteine nebulizer, terbutaline bronchodilator, etc., to promote the discharge of phlegm. 3. Other: For infants and young children or the bedridden elderly, it is difficult to cough out the phlegm in the airway, you can use electric or manual sputum aspirator, so that the phlegm can be discharged as much as possible, to prevent causing respiratory obstruction and affecting respiration. It should be noted that oral medications are used after meals to reduce gastrointestinal mucosal irritation, cephalosporins are contraindicated during the use of alcohol; antihistamines are contraindicated during treatment to engage in hazardous work or the operation of precision instruments; nebulization therapy to avoid overdose. In short, when the sputum is thin, we should consult a doctor in time and follow the doctor’s instructions for examination and treatment.