Sinusitis nose can not smell any odor, mostly due to nasal mucosal swelling caused by nasal congestion or due to inflammation caused by long-term stimulation of the sense of smell caused by hyposmia. Sinusitis can be divided into acute sinusitis and chronic sinusitis. In acute sinusitis, the nasal mucosa is swollen due to inflammation and purulent secretions accumulate in the common nasal tract. If both sides are affected at the same time, the nasal congestion is persistent and therefore it is difficult to smell the odor. Chronic sinusitis can be associated with microbial (e.g., bacterial, viral, etc.) infections, immunodeficiency, epithelial dysfunction, and other mechanisms, in which prolonged and recurrent inflammatory stimulation of the nasal mucosa not only manifests as nasal congestion, but also olfactory dysfunction, temporary or permanent dysfunction of the sense of smell, and other symptoms. Histologic studies also support the theory of viral involvement of the central nervous system, which may be the result of viral or toxic products affecting the olfactory center, and it is usually difficult to recover from this type of olfactory dysfunction. Those who are diagnosed with sinusitis are advised to actively follow their doctor’s instructions so as not to jeopardize their quality of life.