Anosmia is the loss of smell that can be a temporary or permanent condition. This condition can be caused by a Covid-19, severe sinus infection, nasal polyps, etc. One can even be born with anosmia, which is actually called congenital anosmia. Determining how to treat anosmia first starts with treating the problem that is causing it. People should be aware that it may be hard to find the cause or to even treat anosmia. It could go away on its own or just stay permanently.
It was interesting reading about Karl Wuensch, who also had anosmia. The reason for his anosmia was due to large polyps in his sinuses and severely swollen turbinates. When he first got diagnosed, he learned that it would be difficult to treat. However, he tried to stay positive and find alternate ways when cooking and eating food. There were times when his anosmia condition would respond to treatment, but he ended up losing and regaining his sense of smell over four times.