Question: what are the side effects of holding in a sneeze?
Answer: Ruptured eardrum. When you hold in the high pressure that builds in your respiratory system before a sneeze, you send some air into your ears. ... 
Middle ear infection. ... 
Damaged blood vessels in the eyes, nose, or eardrums. ... 
Diaphragm injury. ... 
Aneurysm.
Throat damage. ... 
Broken ribs.