What are possible complications from diphtheria?

Rare: Diphtheria, once common, is now a rare disease in developed countries due to widespread vaccination programs. It is characterized by fever and membranous coating of the upper airways. The coating and throat swelling can cause death by asphyxiation. Skin lesions can develop from toxin formation. Also myocarditis (inflammation of heart) and neuropathy can occur.

A few: Serious complications include severe neck swelling accompanying airway obstruction, myocarditis, and peripheral neuropathies.