Young's syndrome is a condition of combined syndromes such as bronchiectasis, rhinosinusitis, and reduced fertility. It is also referred to as Azoospermia sinopulmonary infections, Sinusitis-infertility syndrome, and Barry-Perkins-Young syndrome.

Affected individuals have normal lung function but with an abnormally viscous mucus. The reduced fertility results from a functional obstruction of sperm transport down the genital tract at the epididymis where the sperms are found in viscous, lipid-rich fluid.

Studies suggest that affected individuals had contact with mercury, which caused the symptoms.