<unk> , also known as smell blindness, is the loss of the ability to detect one or more smells.<unk>  may be temporary or permanent. It differs from hyposmia, which is a decreased sensitivity to some or all smells.<unk>  can be due to a number of factors, including an inflammation of the nasal mucosa, blockage of nasal passages or a destruction of one temporal lobe. Inflammation is due to chronic mucosa changes in the lining of the paranasal sinus and in the middle and superior turbinates. When<unk>  is caused by inflammatory changes in the nasal passageways, it is treated simply by reducing inflammation. It can be caused by chronic meningitis and neurosyphilis that would increase intracranial pressure over a long period of time, and in some cases by ciliopathy, including ciliopathy due to primary ciliary dyskinesia. The term derives from the New Latin<unk> , based on Ancient Greek ἀν- (an-) + ὀσμή (osmḗ, "smell"; another related term, hyperosmia, refers to an increased ability to smell). Some people may be<unk>  for one particular odor, a condition known as "specific<unk> ". The absence of the sense of smell from birth is known as congenital<unk> . In the United States, 3% of people aged over 40 are affected by<unk> .<unk>  is a common symptom of COVID-19 and can persist as long COVID.
Anosmia
Dysosmia
Phantosmia
Aspermia
Hyperhidrosis
Hyperosmia
Buphthalmos
Xerophthalmia