###Human: Has my chronic sinusitis lead to asthma? ###Assistant: Hi. I can understand your concern. Yes, chronic sinusitis can cause asthma. Recurrent respiratory tract infections including sinusitis can cause asthma especially adult onset asthma. But better to first get done spirometry study with bronchodilator reversibility. If spirometry is showing an obstructive defect with good bronchodilator reversibility, then asthma is likely. But, if spirometry is showing obstructive defect without bronchodilator reversibility then bronchitis is more likely. Please let me know that do you smoke? Do you have allergies? Please reply me with answers to these questions so that I can guide you better. I will be happy to help you further.