Shin Splints Explained:
Common Conditions We Treat (and Why They Happen)
Shin splints is a broad term used to describe pain along the inner edge of the shinbone (tibia), and it’s one of the most common complaints among runners, military recruits, dancers, and anyone who has recently ramped up their physical activity. The clinical term—medial tibial stress syndrome—reflects what’s actually happening: repetitive stress on the tibia and the soft tissues that attach to it, leading to inflammation, microdamage, and pain. Left unaddressed, what starts as an aching nuisance can progress into a stress fracture.
Medial Tibial Stress Syndrome
The tibia absorbs enormous impact forces with every step. When training volume increases faster than the bone and surrounding tissue can adapt, the periosteum—the connective tissue covering the bone—becomes irritated and inflamed. This produces the characteristic dull, aching pain along the inner lower leg that typically starts at the beginning of a run, briefly improves as things warm up, and returns worse after activity.
Muscle Imbalances and Calf Overload
Weakness in the hip abductors and core muscles forces the lower leg to compensate with every stride, increasing rotational stress on the tibia. At the same time, tight or overworked calf muscles and the posterior tibialis (a deep muscle that supports the arch) can pull excessively on their bony attachments along the shin, contributing directly to the periosteal irritation.
Training Errors
Too much, too soon is the most common cause of shin splints. Sudden increases in mileage, adding speed work, transitioning to harder surfaces, or returning to training after time off all place more demand on the tibia than it’s currently prepared to handle. Footwear that lacks adequate support or is worn out compounds the problem.
Biomechanical Factors
Overpronation—where the foot rolls excessively inward during the gait cycle—increases the rotational load on the tibia and is a well-established risk factor for shin splints. Leg length discrepancies, poor running mechanics, and running with an excessive forward lean can all contribute to abnormal tibial loading patterns.
Stress Fracture: When to Be Concerned
Shin splints and tibial stress fractures exist on a continuum. If pain becomes localized to a very specific point on the bone, worsens significantly with activity, or persists at rest, a stress fracture must be ruled out. Unlike shin splints, stress fractures require a period of protected weight-bearing and are not appropriate for manual therapy or continued loading. Clinical evaluation—and sometimes imaging—is essential to distinguish between the two.
The Bottom Line
Shin splints are a signal that the body is being asked to do more than it’s currently adapted for—not a reason to simply push through. With proper soft tissue care to reduce tension in the surrounding muscles, correction of the underlying biomechanical contributors, and a sensible return-to-activity plan, most cases resolve fully without the need for imaging or prolonged rest. The key is addressing the problem before it progresses.