Fluid

• Fluid in your middle ear can cause ringing in your ears.
  
  

Infection

• Infections in your middle or inner ear can be the cause of tinnitus.
  
  

Disease

• Diseases such as Meniere's disease has symptoms of a constant ringing of the ears.
  
  

Damage to the Nerve Endings

• Damage to the microscopic nerve endings in the inner ear is a common cause of tinnitus.
  
  

Aneurysm or Brain Tumor

• In rare instances, it could be a signal of something more serious, such as an aneurysm or a brain tumor.
  
  

Loud Noises

• Long-term exposure to loud noises can lead to hearing loss as well as to ringing in your ears.