The Fifty-Nine Hospital has an otolaryngology department that can treat sinusitis. For general sinusitis, you can also use enzyme nasal wash to restore the mucosa in the sinuses. Once the mucosa is healed, the sinusitis will disappear. Note that it is an enzyme, not a hormone, nor salt water. After the sinusitis is cured, just pay more attention to keeping warm and protecting the nasal cavity every day. Unless there are special industrial and mining enterprises, the air in Yunnan is generally good, so just pay more attention to keeping warm.