Sever's Disease (Calcaneal Apophysitis): This is the most common cause of heel pain in adolescents, particularly during the growth spurt of puberty. It is an inflammatory condition of the growth plate in the calcaneus, leading to pain and tenderness.

Plantar Fasciitis: Although more common in adults, plantar fasciitis can occur in teenagers, especially those who are active in sports. It involves inflammation of the plantar fascia, leading to pain in the heel and bottom of the foot.
Achilles Tendinitis: This condition involves inflammation of the Achilles tendon and can cause pain in the back of the heel. It is common in athletes, especially those involved in running and jumping sports.
Overuse Injuries: Heel pain in adolescents can also be due to overuse injuries from repetitive stress on the heel, such as from running or playing sports on hard surfaces.

Tumor (e.g., Osteoid Osteoma): Although rare, a tumor in the heel can cause persistent pain. Missing this diagnosis could lead to delayed treatment and potentially serious consequences.
Infection (e.g., Osteomyelitis): An infection in the bone or soft tissue of the heel can cause severe pain and requires prompt antibiotic treatment to prevent serious complications.
Fracture: A stress fracture or other type of fracture in the heel can cause significant pain and needs to be diagnosed and treated appropriately to avoid further injury.

Rheumatologic Conditions (e.g., Juvenile Idiopathic Arthritis): Certain rheumatologic conditions can cause heel pain, although they are less common in this age group.
Nerve Entrapment (e.g., Tarsal Tunnel Syndrome): This condition involves compression of the posterior tibial nerve and can cause pain, numbness, and tingling in the heel and foot.
Inflammatory Conditions (e.g., Seronegative Spondyloarthropathies): Conditions like ankylosing spondylitis or reactive arthritis can cause heel pain, but are less common in adolescents.