Read the following case and answer the questions in full sentences showing your understanding of the material studied.

Carmine DiStefano is visiting Dr. Salpega today with his 1-year-old son, Lucas, who has been very restless and has not been sleeping very well during the past few nights. During the day, he hardly eats and is constantly tugging on his left ear. Mr. DiStefano is concerned because his 5-year-old daughter, Sophia, struggles with chronic otitis media and has recently had tubes placed in her ears. He is certain that Lucas has an ear infection.

Questions:

What is an indication that Lucas has an ear infection?
What is chronic otitis media?
What are the symptoms of otitis media?
Name 3 reasons why people suffer from otitis media.
Explain how hearing works.