New research from Jefferson Health in Philadelphia suggests that a procedure called stellate ganglion block is somewhat effective at reducing parosmia in patients who suffered from the condition for at least six months after their Covid illness and didn’t respond to pharmaceutical or topical therapies.

The treatment involves injecting an anesthetic into the stellate ganglion — a tangle of nerves in the neck that deliver signals to the head, neck, arms and upper chest. It has been used for decades to treat chronic pain.

— Read more in Neck injection could improve smell issues in some long Covid patients at NBC News.