The causes of acute sinusitis are bacterial infection, caused by dental disease etc. And the causes of chronic sinusitis are nasal obstruction, transformation from acute sinusitis, stronger bacterial infection and so on. 1, germs infection. The germs that cause sinusitis are mostly hemolytic streptococcus. Some fungi may also cause sinusitis to occur. Some allergic patients are also prone to sinusitis. As sinusitis is mostly caused by germs, antibiotics become the most important therapeutic drugs in the treatment. 2, dental disease induced. Some dental diseases cause anaerobic bacteria to be produced in large quantities, and these bacteria enter the nasal cavity, resulting in acute sinusitis. Some patients have problems with the roots of their teeth, but they do not pay attention to them and do not treat them in time, so that they suffer from chronic sinusitis. Therefore, when there is a problem with the teeth, it must be treated in time. 3, from acute to chronic. Acute sinusitis has a short course, about three months. Some people don’t pay enough attention to nose problems, thinking it’s just a cold, which leads to acute turning into chronic. Some patients’ acute sinusitis is not cured, and after two or three episodes, it turns into chronic sinusitis. Sinusitis causes pain to the patients, and if you want to avoid getting this disease, you should exercise more and improve your physical fitness. Use the right method to remove nose discharge instead of blowing your nose.