What causes lower leg pain on running?

Shin splints: Shin splints is a common cause. Other causes can be tendinitis, muscle strain or fatigue, stress fracture, or compartment syndrome.

Many causes: Common causes of running related leg pain include medial tibial stress syndrome (commonly known as shin splints), stress reaction or stress fracture of bone, muscle-tendon injury (strain, tear, tendonitis, tendonosis). Less common causes include exertional compartment syndrome, nerve or vascular entrapment, fascial hernia, exertional dvt, synostosis, etc. See a sports med specialist.