Phantosmia is a medical condition characterized by the perception of smells that are not present in the environment. Individuals experiencing phantosmia may detect odors that can be pleasant or unpleasant, often described as foul or rotten. This phenomenon can occur due to various factors, including neurological disorders, sinus infections, or head injuries. The exact cause of phantosmia is not always clear, but it may involve issues with the olfactory system, which is responsible for the sense of smell. Treatment options depend on the underlying cause and may include medications or therapies aimed at addressing the specific condition contributing to the phantom smells.