Whether or not subcutaneous injection of drugs affects the lungs depends mainly on the drug injected; if the drug injected has pharmacological or toxicological effects on the lungs, it will naturally affect the lungs. Drugs are clinically used to treat a wide range of diseases, different drugs have different indications, and the way of administration also varies, subcutaneous injection is one of the ways of drug delivery. For people who use subcutaneous injections, if the drug injection itself is used to treat lung diseases, then it will naturally have a direct impact on the lungs. In addition, the drug itself has certain toxicological effects, and if this toxicological effect is applied to the lungs, it will naturally have a negative impact on the lungs and cause some pulmonary side effects, such as emphysema. In conclusion, there is no direct link between whether a drug affects the lungs and whether it is administered by subcutaneous injection or not. Individuals should follow the doctor’s instructions for medication regardless of what medication is used, and inform the physician of any unusual adverse reactions that occur after the medication has been administered for prompt treatment.