Osmophobia

Osmophobia, or olfactophobia, refers to a fear, aversion or psychological hypersensitivity to odors; it is a consistent part of many migraine patients' history, though additional criteria are needed to differentiate it from episodic tension-type headache, and it generally occurs in chronic migraine sufferers who may have odor-triggered migraines. Such migraines are most frequently triggered by foul odors, though the hypersensitivity may extend to all odors, and one study found as many as twenty five percent of migraine sufferers had some degree of osmophobia; the condition may also be present during opioid withdrawal, usually associated with nausea or vomiting. The term comes from the Greek osme, smell or odor, and phobos, fear.