Possible Clues:

• Cavities utilised in a ship
• Allergies may congest them
• Deadly thing involves holes in the head
• Origin of neuralgia in Susie's infected cavities
• Cavities centrally placed, sometimes in use simultaneously
• Cavities in skull connecting to nostrils
• They may be cleared with a spray
• Cavities that neti pots clear
• Passages transgress on forms of employment
• Commonly congested cavities