Why Do Runners Get Shin Splints (and How to Prevent Them)?

If you’ve been running for a while, chances are you’ve felt that dull ache down the front or inside of your lower leg — the kind that flares up early in a run and can leave you hobbling later. That’s shin splints, and they’re one of the most common (and frustrating) overuse injuries among runners.

The good news? They’re rarely serious and almost always preventable. But if ignored, they can turn into something more serious. So, why do runners get shin splints in the first place — and what can you do to stop them?

Do You Have Shin Splints?

Shin splints usually start as a dull, aching pain along the front or inner edge of your shinbone (tibia). At first, the discomfort might show up only during a run — especially at the beginning — and fade once you warm up. But if ignored, it can progress into a sharper or more constant pain that lingers even after you stop running.

The area often feels tender to the touch and can become slightly swollen or sensitive when you press along the bone. The pain typically spreads over a few inches of your shin (unlike a stress fracture, which tends to feel sharp and pinpointed in one spot).

If you notice this kind of pain coming on gradually with your training, it’s likely a sign of early-stage shin splints — and your cue to ease up, rest, and reassess your training load.

Why Do Runners Get Shin Splints?

Shin splints — officially called medial tibial stress syndrome — happen when the muscles and connective tissues around your tibia (shinbone) become irritated from repetitive stress. In simpler terms, your lower legs are absorbing more impact than they can currently handle, and the repetitive force from running puts strain on the muscles, tendons, and bones.

They’re most common in runners, but can also affect other athletes in high-impact sports (like dancers) or people with conditions such as osteoporosis.

What Causes Shin Splints

Here are the most common reasons runners get shin splints:

Sudden training increases
Ramping up mileage, speed, or hill training too quickly is the number one cause. Your muscles, bones, and tendons need time to adapt to increased intensity or higher loads, and pushing too far, too soon, overwhelms them.

Old or improper shoes
Worn-out shoes lose cushioning and support, forcing your lower legs to absorb extra impact. Shoes that don’t match your gait can also contribute to shin splints.

Foot structure and arch mechanics
Flat feet or abnormally rigid arches can change how your legs absorb impact, placing extra stress on the muscles and tendons along your shins. Overpronation (rolling inward) or underpronation (rolling outward) can both contribute to shin pain over time, especially if your shoes don’t provide the right support or stability for your gait.

Hard or uneven surfaces
Hard pavement and cambered roads increase stress on your legs with every step. Constantly running on one type of surface — especially pavement or tarmac —can also lead to overload.

Weak or tight lower-leg muscles
Tight calves or weak muscles in the shins and feet mean the smaller stabilizers are doing more than their share. Over time, that imbalance adds up and can lead to shin pain.

Poor running form
Overstriding, heel striking, or collapsing arches can all increase the load on your shins. Even small biomechanical inefficiencies become magnified over thousands of steps.

Body weight
Heavier runners — whether due to muscle, fat, or height — face more impact force with each stride, which can raise the risk of shin splints.

In short, shin splints are your body’s way of saying, “Too much, too fast, or too hard.”

What to Do If You Have Shin Splints

If you already have shin splints, don’t panic — but don’t try to “run through it” either. Catching them early and adjusting your training is the fastest way to heal.

Here are some things you can do to treat shin splints:

1. Reduce your mileage or take a few rest days.
A short break now can prevent a much longer layoff later. Replace runs with low-impact cross-training, like cycling, swimming, or the elliptical, to maintain fitness while your shins recover.

2. Ice the area after runs.
Apply ice for 10–15 minutes a few times a day, including after runs, to calm inflammation.

3. Massage and stretch your calves and shins.
Gentle mobility work and foam rolling can relieve tightness and promote blood flow to the area.

4. Change your shoes and running surfaces.
Replace worn-out shoes, vary your running routes, and mix in softer surfaces like grass, dirt, or gravel trails (or even the treadmill). Shoe inserts or supportive insoles can also help by improving foot alignment and reducing the stress placed on your shins.

5. See a physio if pain lingers.
If your shins still hurt after a couple of weeks — or if pain becomes sharp or localized — see a physiotherapist to rule out a stress fracture and identify contributing weaknesses or form issues.

Most mild cases resolve with a few weeks of reduced running and consistent recovery work. But some runners are more prone to chronic shin splints. The best way to manage this is by working with a physio, improving your form, and maintaining a regular strength, mobility, and recovery routine.

How to Prevent Shin Splints

The best cure is prevention — and a few small habits can make a big difference.

Build miles gradually.
When starting a running plan or training for a race, increase mileage or intensity by no more than about 10% per week. This gives your legs time to adapt without excessive stress.

Strengthen your lower legs.
Simple exercises like heel raises, toe walks, and resisted dorsiflexion help build resilience in the shins and calves. Runners also benefit from compound lifts like squats, deadlifts, lunges, and step-ups, plus plyometric moves like single-leg hops, jump rope, and box jumps.

Prioritize mobility and recovery.
Foam roll your calves and shins, stretch your hips and ankles, and make post-run recovery a habit. Just a few minutes of mobility work each day adds up over time.

Wear proper shoes.
Choose running shoes that fit well, match your gait and running style, and replace them every 300–500 miles (500–800 km). Rotating between two pairs — one cushioned for easy runs and one responsive for speed work — helps spread out the stress. If you’re unsure, visit a local running store for a gait analysis and shoe fitting.

Mix up your surfaces.
Alternate between road, trail, and track when possible, or do some runs on the treadmill. Softer terrain reduces repetitive impact and keeps your legs happier over the long term.

Final Thoughts

Shin splints are frustrating, but they shouldn’t stop you from pursuing your running goals. Think of them as a check engine light — your body’s way of telling you to slow down, make some adjustments, and come back stronger.

You should always listen to those early warning signs, respect recovery, and focus on consistency over speed. The sooner you make these small changes, the sooner you’ll be back to running pain-free — and logging miles that actually feel good.