Why does the joint in my big toe hurt?

Arthritis: Arthritis is a common reason for joint pain. Seeing a podiatrist and getting x-rays will tell you if it is present.

Good question: The toe is a very complex structure and has many bones, joints, tendons, muscles and ligaments. I would seek the attention of an orthopedic foot and ankle surgeon to see if there is anything serious going on. You can find one in your area at aofas.Org.