Musculoskeletal strain or injury: This is a common cause of rib pain in adolescents, often due to sports injuries, falls, or overuse. The age and presentation make this a plausible first consideration.

Costochondritis: Inflammation of the cartilage that connects the ribs to the breastbone, which can cause sharp pains in the chest or rib area. It's a common condition in adolescents.
Precordial catch syndrome: A condition characterized by sudden, sharp chest pain, often related to the ribs or chest wall, which can be recurrent and is common in adolescents.
Scoliosis or thoracic spine issues: Abnormal curvature of the spine or issues with the thoracic spine can lead to rib pain due to altered biomechanics and stress on the rib cage.

Pneumonia or pulmonary embolism: Although less common, these conditions can present with rib pain and are critical to diagnose early due to their potential severity and need for prompt treatment.
Pulmonary or mediastinal tumors: Rare, but potentially life-threatening conditions that could cause rib pain due to local invasion or pressure effects.
Osteomyelitis or osteosarcoma of the ribs: Infections or tumors of the bone can cause localized pain and are important to identify due to their significant implications for treatment and prognosis.

Slipping rib syndrome: A condition where the ribs slip out of place, causing pain, which is less common but can be considered in cases where other diagnoses are ruled out.
Tietze's syndrome: Similar to costochondritis but involves the inflammation of the cartilages and surrounding tissues, leading to pain and swelling.
Ehlers-Danlos syndrome or other connective tissue disorders: These conditions can lead to musculoskeletal issues, including rib pain, due to the abnormal structure of connective tissue.