Pharyngitis/Tonsillitis: This is a common condition in adolescents, often caused by viral or bacterial infections, leading to severe throat pain, which can radiate to the ears and neck due to shared nerve pathways.

Otitis Media/External: Infections of the middle ear or external ear canal can cause severe ear pain and may be accompanied by throat and neck pain due to referred pain.
Lymphadenitis: Inflammation of the lymph nodes in the neck can cause neck pain and tenderness, often accompanied by ear and throat pain if the infection spreads or if there is significant lymph node swelling.
Mastoiditis: An infection of the mastoid bone, which is located behind the ear, can cause severe pain in the ear, throat, and neck, especially if the infection spreads.

Epiglottitis: A potentially life-threatening condition that causes severe throat pain and can lead to airway obstruction. It's less common but critical to diagnose early.
Retropharyngeal Abscess: A serious infection in the tissues at the back of the throat, which can cause severe throat and neck pain and can lead to airway compromise if not treated promptly.
Lemierre's Syndrome: A rare but serious condition characterized by a bacterial infection of the throat, leading to thrombophlebitis of the internal jugular vein and potentially life-threatening complications.

Temporal Arteritis/Giant Cell Arteritis: Although more common in older adults, it can rarely occur in younger individuals, causing severe headache, jaw claudication, and potentially vision loss, with some patients experiencing ear and throat pain.
Torticollis: A condition characterized by a twisted neck, which can cause severe neck pain and stiffness, and may be accompanied by ear and throat pain due to muscle spasm and referred pain.
Cervical Spine Infection (e.g., Discitis, Osteomyelitis): Infections of the cervical spine can cause severe neck pain and stiffness, potentially radiating to the throat and ear due to the proximity of anatomical structures.