What can be the causes of chest pain?

Many: Many things can cause chest pain, including muscle strain, inflammation of cartilage, infection, blood clot in the lung and heart disease. A doctor will take a complete history, perform an examination and order appropriate tests to sort out the cause of chest pain.

Multiple things: Including but not limited to heart (cardiac) issues, chest muscle strains, rib/musculoskeletal issues/inflammation, acid indigestion causing "heart burn", arthritis in your back affecting the vertebrae where nerve is that innervates your heart, anxiety, etc., etc., So get eval to determine your cause. Good luck.

Lots of things: Obviously heart disease (blocked heart arteries), but for someone as young as you that is less likely-- unless there is a very strong family history of early heart attacks. More common --anxiety/panic attacks, acid reflux/heartburn. People sometimes also have chest pain from irregular heart rhythms or some leaky heart valves. You should see your regular doctor to discuss.