Which symptom is characteristic of mastoiditis in children?

Tender swelling behind the ear is indeed a characteristic symptom of mastoiditis in children. Mastoiditis is an infection of the mastoid process, which is located just behind the ear. When this area becomes infected, it leads to inflammation and swelling, resulting in tenderness in that region. This symptom is typically easy to observe during a physical examination and indicates that the infection may have progressed from a middle ear infection (otitis media) to involve the mastoid bone.

While severe headache, redness of the ear, and fever can accompany mastoiditis or suggest other infections, they are not specific indicators of this condition. Tender swelling is a more direct sign of the mastoid's involvement and is used to guide further diagnostic and treatment decisions in clinical practice. Recognizing this symptom can significantly aid healthcare providers in managing the patient's condition effectively.