Shin pain is most commonly caused by medial tibial stress syndrome, widely known as shin splints. This overuse injury affects between 13.6% and 20% of runners and up to 35% of military personnel, making it one of the most frequent lower leg complaints in active people. But shin splints aren’t the only explanation. Depending on where the pain is, when it shows up, and how long it lasts, your shins could be signaling anything from a minor muscle strain to a stress fracture.
Shin Splints: The Most Likely Cause
Shin splints happen when repetitive impact creates inflammation along the surface of the shinbone (tibia) and microtrauma in the underlying bone. Each time your foot strikes the ground during running or jumping, cyclic forces stress the bone at a microscopic level. When your body can’t repair that damage as fast as you’re creating it, you get pain that spreads along the inner or outer edge of your shin.
There are two types. Medial shin splints cause pain along the inner border of the shinbone, involving the muscles that run behind the ankle and attach across the sole of your foot. Anterior shin splints cause pain along the outer edge, involving the muscles that lift your foot and toes. Medial shin splints are far more common, especially in runners.
The hallmark of shin splints is that the pain shows up during running, particularly at faster speeds, but goes away when you stop. Walking and everyday activities typically don’t hurt. The tenderness is spread across a few inches of bone rather than concentrated in one spot.
What Increases Your Risk
A sudden jump in training volume is the single biggest trigger. Adding too many miles, too many hill repeats, or too many days of running per week without a gradual buildup overwhelms the bone’s ability to adapt. Other risk factors include excessive foot pronation (where the arch rolls inward too much with each step), running on hard or sloped surfaces, low calcium intake, and a history of previous shin injuries.
Worn-out shoes also play a role. Most daily running shoes last between 300 and 500 miles. Lightweight racing shoes break down faster, often around 250 to 300 miles. Once the cushioning and support degrade, the impact forces reaching your shins increase. If you can’t remember when you bought your current pair, that alone could be contributing to your pain.
People with stronger calf muscles relative to the muscles in the front of the shin, or those with a pronounced inward tilt of the forefoot or heel, also face higher risk. These structural factors change how force distributes through the tibia during each stride.
When It Might Be a Stress Fracture
Shin splints and stress fractures exist on a spectrum of bone overload, and telling them apart matters because the treatment timelines are very different. The key distinction is how the pain behaves over time.
With shin splints, pain appears during running and fades when you stop. With a stress fracture, the pain initially feels similar but gradually worsens. Over weeks, you’ll start feeling it while walking and during other daily activities. Eventually, it may persist even at rest. Stress fracture pain also tends to be pinpointed to one specific spot on the bone, often a dime-sized area you can press with a finger, rather than the broader, diffuse tenderness of shin splints.
If your shin pain has been getting progressively worse, has started bothering you outside of exercise, or produces sharp discomfort when you press on a single point, imaging is typically needed to confirm or rule out a fracture. Untreated stress fractures can progress to complete breaks.
Compartment Syndrome
A less common but more serious cause of shin pain is chronic exertional compartment syndrome. The muscles in your lower leg are organized into tight compartments wrapped in connective tissue. During exercise, muscles swell with blood flow. In some people, the compartment doesn’t expand enough to accommodate this swelling, and pressure builds up inside.
This condition feels different from shin splints. The pain is often described as a deep, cramp-like pressure that builds during exercise and can come with numbness, tingling, or subtle weakness in the foot. The symptoms typically ease within minutes of stopping activity but return reliably the next time you exercise at the same intensity. If rest alone doesn’t resolve your shin pain, or if you’re noticing any neurological symptoms like tingling or a foot that feels “dead,” pressure testing can determine whether this is the cause.
Other Possible Causes
Tendinitis around the shin, particularly of the posterior tibial tendon on the inner side, can mimic shin splints but tends to produce pain that’s more focused near the ankle or along the tendon itself rather than the broad surface of the bone. Nerve entrapment in the lower leg can cause burning or shooting pain that doesn’t follow the typical pattern of bone-related injuries. In rare cases, blood vessel problems like popliteal artery compression can produce exertional leg pain that feels like a deep ache or cramping.
For people who aren’t active, shin pain can also come from simply starting a new walking routine, switching to unsupportive footwear, or spending long hours on concrete floors. The mechanism is the same: more repetitive stress than the bone and surrounding tissues are conditioned to handle.
How Shin Splints Heal
Shin splints typically resolve in three to four weeks with adequate rest. “Rest” doesn’t necessarily mean doing nothing. It means pulling back from the activity that caused the pain. Swimming, cycling, or pool running let you maintain fitness without impact. The key guideline is simple: use pain as your signal. If an activity makes your shins hurt, scale it back.
Icing the painful area for 15 to 20 minutes after activity and wearing supportive shoes during the day can help manage discomfort during recovery. If overpronation is a factor, motion-control shoes or custom insoles reduce the inward rolling that stresses the inner tibia.
When you return to running, start at roughly half your previous volume and increase by no more than 10% per week. Jumping back to your old mileage is the fastest way to end up right back where you started. Warming up properly before runs, varying your running surfaces, and replacing shoes before they lose their cushioning all reduce the chance of recurrence.
Pain That Doesn’t Improve With Rest
Most shin pain responds well to reducing activity. When it doesn’t, that’s a signal something beyond standard shin splints is going on. Pain that persists after several weeks of rest, pain that worsens during walking or at rest, neurological symptoms like numbness or weakness, or swelling localized to one spot on the bone all warrant further evaluation. Imaging can distinguish between shin splints, stress fractures, and compartment syndrome, each of which requires a different approach and timeline for recovery.