Shin splints
What it is
Pain along the inside edge of the shinbone, caused by inflammation of the muscles, tendons and bone tissue around it.
Why it happens
A sudden increase in running distance or intensity, running on hard surfaces, worn-out shoes, or flat feet. It is very common at the start of a season or when starting a new sport.
Osgood-Schlatter disease
What it is
Pain and swelling at the bony bump just below the kneecap, where the patellar tendon attaches to a growth plate at the top of the shin. It only happens while you are still growing, and it does not cause permanent damage.
Why it happens
Running, jumping and kicking repeatedly pull on the growth plate through the tendon, most often between about 10 and 15 during growth spurts, in sports like football, basketball, volleyball and gymnastics.
Jumper's knee (patellar tendinitis)
What it is
Pain in the tendon that connects the kneecap to the shin, felt just below the kneecap, that starts during or after activity and gradually begins to interfere with training.
Why it happens
Repeated jumping and landing overloads the tendon faster than it can repair, common in basketball, volleyball, athletics and dance. Tight thigh muscles and sudden increases in training make it more likely.