Analysis of the causes should consider the following aspects: 1, it may not be asthma, I do not know whether the diagnosis was confirmed by pulmonary function and diastolic test. 2, the method of drug administration did not master, did not use a breath to quickly inhale the drug into the deep part of the lungs and hold the breath for 10 seconds. 3, the dose of the drug is too small, Sulindac has three dose specifications, adults generally use 50/250 micrograms of the kind. 4. Allergic factors are not removed and continue to trigger your asthma. 5, there are other diseases exist at the same time, such as pneumothorax, pleural adhesions, infection, etc.