Yes, one can develop asthma in ones 20's and it can get worse over several weeks. It could be that you are not using the correct dose of therapy, not using your preventative therapy correctly, or it may mean that asthma is getting worse and you may need additional add-on therapy. The reasons behind your asthma getting worse also need to be investigated. I suggest you see a lung specialist or a doctor experienced in treating asthma.
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