Sinusitis is categorized into acute and chronic sinusitis, if the symptoms are mild, it can cause temporary olfactory impairment, if it causes degeneration of nerve endings or degenerative changes of the mucosa in the olfactory region, a few of them can also be permanent loss of smell. When acute sinusitis occurs, due to acute inflammation, there is inflammatory swelling of the nasal mucosa and purulent secretions will block the nasal cavity, resulting in nasal congestion, which leads to conductive olfactory hyposmia, which can be recovered with the improvement of nasal congestion and sense of smell, but a few will also be left with permanent hyposmia. Chronic sinusitis can cause symptoms such as decreased sense of smell or loss of smell. Due to prolonged nasal lesions, the mucous membrane in the olfactory region has inflammatory lesions or degenerative changes, and the olfactory nerve endings can be denatured due to inflammation, which in a few cases can result in permanent loss of smell. When the diagnosis of sinusitis patients with decreased sense of smell, it is recommended to actively go to the hospital specialist, follow the doctor’s instructions to standardize the use of medication and treatment.