Shin Splints Running: Causes, Prevention, When to Stop

You are three weeks into a new training block. The volume is up, the long run is longer, and you added a hill session on Wednesday. Everything felt great until this morning, when a dull ache appeared along the inside of your left shin about two kilometres in. You pushed through. By the end of the run it was sharp enough to change your stride, and now it hurts walking down stairs.

This is how shin splints running injuries usually start. Not with a single dramatic moment, but with a slow build that runners often dismiss as tightness or fatigue until it becomes impossible to ignore. The good news is that shin splints are well understood, highly preventable, and manageable if you catch them early. The bad news is that ignoring them can turn a two-week setback into a two-month one.

This guide covers what shin splints actually are, what causes them in runners, how to prevent them, and when you need to stop running and get professional help.

What Shin Splints Actually Are

"Shin splints" is the common name for medial tibial stress syndrome (MTSS). According to the Mayo Clinic, shin splints are pain along the shin bone (tibia), the large bone in the front of the lower leg. They are common in runners, dancers, and military trainees.

The condition involves repetitive microtrauma to the tibialis posterior, soleus, and flexor digitorum longus muscles, as well as irritation of the tibial periosteum (the outer layer of bone), resulting in localised inflammation. This is according to StatPearls, a peer-reviewed medical resource published by the National Library of Medicine.

According to Healthdirect Australia, there are two main types of shin splints. Medial tibial stress syndrome (MTSS) is the most common type and causes pain along the inner edge of the shinbone. Anterior tibial stress syndrome causes pain along the front of the lower leg. Both types share similar symptoms, but the location of pain differs.

The important thing to understand is that MTSS sits on a continuum. StatPearls describes it as an early stage within the continuum of tibial stress injuries, noting that it may advance to tibial stress fractures when unmanaged. This is why early recognition and activity modification matter. What starts as inflammation can progress to bone damage if you keep loading it.

What Causes Shin Splints in Runners

Shin splints running injuries rarely come from a single cause. They are almost always the result of several factors stacking up at once.

Training load errors. This is the big one. According to the Mayo Clinic, the risk of shin splints is higher for people who quickly increase how long, how often, or how hard they exercise. The American Academy of Orthopaedic Surgeons (AAOS) breaks this down further, listing changes in frequency (increasing the number of days you exercise each week), changes in duration (running longer distances), and changes in intensity (running on hills after running on only flat surfaces) as contributing factors.

If you went from three runs a week to five, or jumped your long run from 10 kilometres to 16, that is the kind of change that puts you in the risk zone.

Running surface. According to the Mayo Clinic, running on uneven ground such as hills, or on hard surfaces such as concrete, increases shin splint risk. Better Health Channel (Victoria) recommends choosing flat, softer surfaces to run on, such as running tracks or grassy ovals, to reduce the risk. If you have recently switched from trail to road, or from a treadmill to footpath running, your shins are absorbing significantly more impact per stride.

Foot mechanics and biomechanics. According to the AAOS, having flat feet or abnormally rigid arches contributes to shin splints. Healthdirect Australia adds that excessive pronation (inward rolling of the foot) and differences in leg length are also factors. Better Health Channel notes that poor running form, such as rolling the feet inwards, can strain the muscles and tendons of the lower leg.

Footwear. According to the AAOS, exercising with improper or worn-out footwear is a contributing factor. The Mayo Clinic recommends replacing running shoes about every 350 to 500 miles (560 to 800 kilometres). If you have been running in the same pair for a year, that cushioning is not doing what it used to.

Weak or tight muscles. Healthdirect Australia identifies weak or tight muscles in the calves, hips, or core as a cause of shin splints. When these muscles cannot absorb and distribute impact forces effectively, the tibia and its periosteum take more of the load.

Symptoms: How to Recognise Shin Splints Early

The earlier you identify shin splints, the faster you recover. According to the Mayo Clinic, if you have shin splints you might notice tenderness, soreness, or pain along the inner side of your shinbone and mild swelling in your lower leg. At first, the pain might stop when you stop exercising, and it might feel better with stretching.

Healthdirect Australia describes the pain as usually dull and aching, getting worse with activity, and improving with rest. The painful area may also be swollen and sore to touch.

Better Health Channel adds that the overlying skin may be red and inflamed, and that pain may be felt before, during, or after running.

The pattern most runners experience goes like this: pain at the start of a run that fades as you warm up, then returns afterwards. As it progresses, the pain stays through the entire run. Eventually, it hurts at rest. If you are at stage one, you can likely manage this with load adjustments. If you are at stage three, you need to stop and get assessed.

When to Stop Running

This is the question every runner with sore shins asks, and the answer depends on where you sit on that progression.

You can likely keep running (with modifications) if: the pain is mild, appears only at the start of a run, settles with warming up, and does not change your running form. Reduce your volume, avoid hard surfaces, and monitor daily.

You should stop running if: the pain persists throughout the entire run, alters your stride, is present when walking, or is getting worse session to session. According to the Mayo Clinic, you should call your healthcare professional if rest, ice, and over-the-counter pain relievers do not ease your shin pain. The AAOS notes that other conditions, including stress fractures, tendinitis, and chronic exertional compartment syndrome, can cause similar shin pain and need to be ruled out.

Healthdirect Australia warns that untreated shin splints can worsen over time and may lead to a stress fracture in the shin bone. Better Health Channel recommends seeing your doctor if the pain is severe, or if it does not start to ease after a few days of rest and home treatment.

The cost of stopping for a week is small. The cost of running through a developing stress fracture is months. Be honest with yourself about where the pain sits.

How to Treat Shin Splints

Treatment for shin splints is straightforward. It does not require expensive equipment or complicated protocols.

Rest and load reduction. According to the AAOS, standard treatment includes several weeks of rest from the activity that caused the pain. This does not necessarily mean doing nothing. The AAOS recommends substituting lower-impact aerobic activity during recovery, such as swimming, using a stationary bike, or an elliptical trainer.

Ice. The AAOS recommends using cold packs for 20 minutes at a time, several times a day, without applying ice directly to the skin. Better Health Channel suggests applying an icepack for 10 to 20 minutes, about three or four times daily.

Anti-inflammatory medication. According to the AAOS, anti-inflammatory medications like ibuprofen, aspirin, and naproxen can reduce pain and swelling. Always follow the directions on the pack or your doctor's advice.

Stretching and strengthening. The AAOS recommends flexibility exercises, noting that stretching your lower leg muscles may make your shins feel better. The Hospital for Special Surgery (HSS) adds foam rolling and strengthening exercises as part of a complete treatment approach.

Supportive footwear. According to the AAOS, wearing shoes with good cushioning during daily activities will help reduce stress on your shins. The Mayo Clinic recommends arch supports, especially if you have flat arches, and shock-absorbing insoles to reduce symptoms and prevent recurrence.

Professional assessment. Healthdirect Australia recommends seeing a physiotherapist or exercise physiologist who can guide you through exercises to improve strength, flexibility, and running form. Better Health Channel suggests consulting a podiatrist for orthotics if you have flat feet, and a physiotherapist for correction of biomechanical factors.

How to Prevent Shin Splints

Prevention is where runners have the most control. If you have had shin splints before, or you are ramping up training for a race like the Gold Coast Marathon or the City2Surf, these are the adjustments that keep you on the road.

Follow the 10 percent rule. The Mayo Clinic recommends about a 10 percent increase in the amount of impact activity per week as a good progression. This applies to total weekly distance, session duration, and intensity. If you ran 30 kilometres last week, cap this week at 33. It sounds conservative. It works.

Rotate surfaces. If you run on concrete every day, your shins are absorbing maximum impact every session. Better Health Channel recommends choosing flat, softer surfaces like running tracks or grassy ovals. Mix in trail, grass, or track sessions alongside your road runs to distribute the load across different terrain.

Replace your shoes on schedule. The Mayo Clinic recommends replacing running shoes about every 350 to 500 miles (560 to 800 kilometres). If you are running 40 kilometres a week, that is roughly every four to five months. Do not wait until the tread is visibly worn. The cushioning and support degrade well before the outside shows it.

Strengthen the muscles that protect your shins. Healthdirect Australia identifies weak or tight muscles in the calves, hips, and core as a cause of shin splints. The Mayo Clinic recommends exercises to strengthen your legs, ankles, hips, and core to help get your legs ready for high-impact sports. Calf raises, toe raises, single-leg balance work, and hip-strengthening exercises like clamshells and glute bridges are all worth building into your weekly routine.

Warm up properly. Better Health Channel recommends thoroughly warming up before exercising and including plenty of slow, sustained stretches in your cool down. Starting a run cold, especially a fast session, puts immediate load on tissues that have not had time to increase blood flow and elasticity.

Cross-train. The Mayo Clinic recommends cross-training with activities that put less impact on your shins, such as swimming, walking, or cycling. Building a well-rounded training plan that includes low-impact sessions gives your bones and connective tissue recovery time between running days.

Get your gait assessed. According to the Mayo Clinic, a sports medicine professional can watch a video of you running to help find areas where you can improve to lower the risk of shin splints. Often, small changes in how you run and exercises to build strength can lower your risk. If shin splints keep coming back despite managing load and footwear, a gait analysis is a worthwhile investment.

Returning to Running After Shin Splints

Coming back too fast is the most common reason shin splints return. StatPearls describes MTSS as commonly developing after a sudden change in activity, often involving a rapid increase in exercise frequency, duration, or intensity. The same pattern that caused the injury in the first place will cause it again if you repeat it.

A practical return-to-running approach:

1. Wait until daily activities are pain-free. Walking, stairs, and standing should all be comfortable before you attempt a run.
2. Start with walk-run intervals. Alternate walking and easy jogging in short blocks. If pain returns during any interval, stop and give it more time.
3. Run on forgiving surfaces first. Grass, trail, or a quality track. Save the concrete for later.
4. Increase volume slowly. The Mayo Clinic's 10 percent guideline applies here too, and you may want to be even more conservative in the first two to three weeks back.
5. Monitor how your shins feel the morning after. The run itself is only half the picture. If you wake up sore and stiff in the shin the next day, you did too much.

If you are building back towards a race, give yourself enough lead time that you are not forced to compress the ramp-up. A structured training plan with built-in progression helps you avoid the temptation to do too much too soon.

Shin Splints vs. Stress Fracture: Know the Difference

Shin splints and stress fractures can feel similar, but they are not the same injury and they require very different responses.

According to the AAOS, a stress fracture is a small crack in the tibia caused by stress and overuse. If shin splints are not responsive to treatment, your doctor may want to make sure you do not have a stress fracture using imaging tests such as a bone scan or MRI.

StatPearls notes that MTSS represents an early point in the continuum of stress-related bone injuries and may advance to tibial stress fractures when unmanaged.

The key differences in how they feel:

• Shin splints typically produce diffuse pain along a broader area of the shin. The pain often eases with warming up and may feel better with rest.
• Stress fractures tend to produce a sharper, more localised pain at a specific point on the bone. The pain usually gets worse with any weight-bearing activity and does not improve with warming up.

If you have a pinpoint spot of intense pain on your shinbone, especially if it hurts when you press on it with a finger, stop running and see a doctor. This is not something to manage on your own.

The Bottom Line

Shin splints running injuries are common, but they are not inevitable. They are your body telling you that the load you are applying has outpaced what your tissues can currently handle. The fix is almost always about managing the variables you control: how quickly you increase training, what surfaces you run on, how often you replace your shoes, and whether you are doing the strength work that protects your lower legs.

If you catch shin splints early and respond with load reduction rather than stubbornness, most runners are back to full training within two to four weeks. If you push through, you risk graduating to a stress fracture that sidelines you for months.

Respect the signals. Adjust the load. Build back gradually. Your shins will thank you for it on race day.