Cat Ear Infection

• According to the American Society for the Prevention of Cruelty to Animals, an ear infection in a cat can be triggered by bacteria, foreign objects stuck within the ear canal and yeast.
  
  

Congestion

• Congestion occurs in a cat's ear when an infection causes the buildup of discharge within the ear canal. This discharge is often yellow or black in color and can have a foul odor.
  
  

Symptoms

• A cat with an ear infection and congestion will shake its head and scratch its ears. In severe cases, a cat can lose its balance or walk in circles, states "What Your Cat Is Trying to Tell You."
  
  

Treatment

• Ear infections can be treated with ear drops prescribed by your veterinarian. She might also flush out your cat's ears to wash away the discharge causing congestion.
  
  

Considerations

• Ear infections and the congestion they cause can be prevented by keeping your cat's ears clean. Your veterinarian can recommend a cleaning fluid that will help.