The membrane surrounding a bird's egg plays an important role in protecting the egg.

He contracted meningitis.

He underwent surgery for appendicitis.

He underwent surgery for appendicitis.

Due to otitis, he found it difficult to listen to music.

My dermatitis was treated by a dermatologist.

He was taken to the hospital because of peritonitis.

My son went to the hospital because of otitis media.

My aphthous ulcer hurts so much that I can't eat.

He was diagnosed with iritis.