Shin Splints vs Stress Fracture: How to Tell the Difference

The short answer: Shin splints cause a spread-out ache along the inner shin that tends to ease when you stop running. A stress fracture usually hurts at one spot you can press with a fingertip, and may ache at rest or at night. Pain that is focused, getting worse, or waking you needs a provider, and possibly imaging, before you run again.

• Shin splints cause tenderness along the inner edge of the shinbone. Pain is often during or after exercise, and may stop when exercise stops [1][4].
• A stress fracture is a tiny crack in the bone from repeated load. It usually hurts at a specific spot, can ache at night or with walking, and may cause swelling or bruising [2].
• The AAFP review says shin splints cause tenderness along a stretch of the shin, while stress fractures cause focal tenderness [3].
• The single-leg hop test is not a reliable way to tell them apart. It was positive in 45.6% of people with shin splints in one review [3].
• An early X-ray often looks normal in a stress fracture. The AAFP review reports about 10% sensitivity at first, rising to 30% to 70% after three weeks [3].
• Do not try to run through bone pain [2]. Pain at rest or at night, a limp, or pain after a fall needs a provider.

Check four things: where it hurts, what happens when you press, whether it hurts at rest, and how it behaves over days.

What this means: spread-out ache that fades when you stop points toward shin splints. A fixed spot that is tender when pressed, or pain when you are not running, points toward a stress fracture. This table is a guide, not a diagnosis. Only a provider can tell for sure, and the two can overlap [1].

Shin splints (medial tibial stress syndrome) are pain along the inside edge of the shinbone (tibia), where muscles attach to the bone [1][4]. OrthoInfo describes inflammation of the muscles, tendons and bone tissue around the tibia [1].

They usually come from doing too much, too soon. Overuse puts repeated strain on the leg. Triggers include sudden changes in how often, how long or how hard you exercise, such as adding hill running after only flat runs [1]. Mayo Clinic adds hard surfaces, flat feet or high arches, and starting a new running program [4]. The NHS lists running on hard surfaces, poor technique and returning to exercise after a break [6]. Runners are at highest risk, and dancers and military recruits are also often affected [1].

A stress fracture is a small crack in the bone. It happens when bone breaks down faster than it can rebuild, usually after a quick jump in activity [2]. Tired muscles absorb less shock, so more stress passes to the bone [2]. OrthoInfo says symptoms often appear 3 to 4 weeks after starting a new routine or season [2].

OrthoInfo describes the pattern this way: a specific sore spot that hurts during or soon after activity and eases with rest at first. If it is not treated, pain comes on during walking and daily tasks, sometimes with a limp, then night-time aching, swelling and bruising [2].

Not reliably. Providers sometimes ask you to hop on the sore leg to look for pain at one spot, and OrthoInfo mentions this [2]. But the AAFP review found no recent studies proving the test is accurate, and it was positive in 45.6% of people with shin splints [3]. A tuning fork test had 75% sensitivity and 67% specificity for tibial stress fractures in one small study [3]. Please don't hop on a painful leg to test yourself. Let a provider examine it.

Because they sit on the same spectrum of overuse. Both start with too much repeated load, both hurt in the shin, and both are common in runners. Mayo Clinic says that if shin pain becomes ongoing, it may point to a stress reaction or stress fracture [4]. OrthoInfo says that when shin splints do not respond to treatment, a doctor may check for a stress fracture, and that tendinitis and chronic exertional compartment syndrome can also mimic shin splints [1].

If you have already read our posts on running with runner's knee or first-step heel pain, the same rule applies here: pain that keeps changing your running is telling you something.

Anyone who trains hard can, but some factors raise the risk. OrthoInfo lists these:

• Cannot change: female sex, older age, genetics, foot and leg alignment, and a previous injury [2].
• Can change: low energy intake, low vitamin D, under 7 hours of sleep, no rest days, weak or tired muscles, worn shoes, hard training surfaces and sudden increases in training [2].

The AAFP review adds that the female athlete triad (an eating disorder, missed periods and low bone density) raises risk [3]. In that review, calcium plus vitamin D for female recruits showed a lower rate in one analysis, but the results were not consistent, so supplements are not a proven shield [3]. If you have several of these factors and recurring shin pain, mention them to your provider. For a plain-language overview of bone density, vitamin D and weight-bearing exercise, you can read Meto's guide to protecting your bone mineral density. It covers general bone health and does not discuss stress fractures or running.

Stop when the pain stops being a mild, spread-out ache that settles quickly. OrthoInfo is direct about stress injuries: "do not try to play or exercise through the pain" [2].

This traffic-light guide is a common clinical rule of thumb, not a tested standard:

The NHS adds that shin splints usually improve within a few weeks, and to see a provider if pain is getting worse or is not improving despite self-help [6]. Mayo Clinic says to call a provider if rest, ice and over-the-counter pain relievers do not ease shin pain [4].

Get imaging if a provider suspects a stress fracture, or if shin pain has not improved after rest and treatment. Mayo Clinic says shin splints are usually diagnosed from your history and a physical exam, with X-ray or other imaging used to check for other causes such as a stress fracture [5].

Here is what the AAFP review reports about each test [3]:

• X-ray: usually first, because it is cheap. It may look normal early. Sensitivity is about 10% at first and 30% to 70% after three weeks. If it is negative and the case is not urgent, it can be repeated after two to three weeks.
• MRI: sensitivity equal to or slightly better than a bone scan, with higher specificity. It can show reactive bone changes that are not true stress fractures.
• Bone scan (scintigraphy): high sensitivity, 74% to 100%.
• CT: lower sensitivity and more radiation than the other options.

Some stress fractures need extra care. The AAFP review lists the front of the tibia among "high-risk" sites that may need an orthopedic or sports medicine opinion [3]. OrthoInfo adds that a bone density (DEXA) scan may be ordered if you have weak-bone risk factors or an injury from light activity [2].

Rest from what caused it, then rebuild slowly.

• Cut back and cross-train. OrthoInfo advises several weeks of rest from the causing activity, with swimming or cycling [1]. Mayo Clinic suggests swimming, biking or water running [5].
• Ice. Ice packs for 15 to 20 minutes, 3 to 4 times a day for several days, wrapped in a thin towel [5].
• Pain relief. Ibuprofen, naproxen sodium or acetaminophen may help [5]. The NHS lists paracetamol (acetaminophen), ibuprofen gel or ibuprofen tablets [6]. Ask a provider or pharmacist what is safe for you.
• Check your shoes. OrthoInfo lists worn-out shoes as a risk factor and suggests supportive, cushioned shoes [1]. Mayo Clinic says to replace running shoes every 350 to 500 miles (about 560 to 800 km) [4].
• Return slowly. Be pain-free for at least two weeks before exercising again [1]. Then build up gradually. Mayo Clinic suggests about 10% more per week [4], and OrthoInfo suggests training less often, for shorter times and at lower intensity at first [1].

For a wider return-to-running plan, see our return to exercise guide and our page for runners.

Expect real time off, and a provider's go-ahead. OrthoInfo says rest usually lasts at least 3 weeks, and more severe injuries can take up to 3 months or longer. You may need a hard-sole shoe, a boot or crutches if walking hurts, and a few slow-healing bones need surgery [2]. The AAFP review says healing typically takes 4 to 12 weeks or longer, and suggests reducing activity to pain-free levels and reassessing every two to three weeks [3].

OrthoInfo says to return only after a provider clears you, and to build up gradually, with alternate activity and rest days, cross-training, and many weeks of progression [2].

Only start these once walking is pain-free and a provider has ruled out a stress fracture. OrthoInfo lists stretching the lower leg muscles among shin splint treatments [1], and Mayo Clinic suggests strengthening legs, ankles, hips and core for prevention [4]. The specific moves and doses below are common clinical starting points, not from a trial.

1. Calf stretch. 

Stand facing a wall with one foot back, heel down and knee straight. Lean forward until you feel a stretch in the calf. Hold 30 seconds. Do 3 times on each side, once or twice a day. See our calf stretch.

1. Calf raise. 

Stand holding a counter. Rise onto your toes slowly over 2 seconds, pause, then lower over 3 seconds. Do 2 sets of 10 to 15 on both legs, 3 or 4 days a week. Progress to one leg when that is easy and pain-free. See our calf raise.

Stop if you feel sharp pain in the shin, pain at one spot on the bone, or shin pain that is worse the next morning. Rest, and check with a provider or physical therapist.

Kai, Loosn's AI physio coach, can help you pace a return to running around your own symptoms. It does not replace an assessment if your symptoms are severe, getting worse or unusual.

Loosn is not a diagnosis tool.

Get help right away (emergency department or urgent care) if [7]:

• you hurt your shin in a fall or injury and it looks out of shape
• you cannot put weight on the leg or use it
• pain is severe, or swelling comes on suddenly after an injury

Call 911 (or your local emergency number) if you have heavy bleeding, a bone through the skin, or feel faint. Other common emergency numbers are 999 in the UK, 112 across the EU and 000 in Australia. In the UK, the NHS says to contact NHS 111 if shin pain is severe or you have injured your shin [6].

See a provider soon if [2][3][4][6][7]:

• pain hurts at rest, or wakes you at night [2]
• you can press one spot on the bone and it is clearly tender [2][3]
• you are limping, or it hurts to walk or do daily tasks [2]
• the shin is swollen or bruised [2], or red, hot, or you have a fever [7]
• rest, ice and over-the-counter pain relievers have not eased the pain [4]
• pain is getting worse or not improving despite self-help [6]
• pain returns every time you restart running [1]
• you have several risk factors, such as missed periods, low energy intake or a past stress fracture [2][3]

Loosn is not a substitute for assessment when symptoms are severe, getting worse or unusual.

How do I know if it's shin splints or a stress fracture? 

Look at where it hurts and when. Shin splints cause tenderness spread along the inner shin, and the pain tends to stop when exercise stops [3][4]. A stress fracture usually hurts at one spot, and can ache at night or with daily walking [2][3]. Only an exam, and sometimes imaging, can settle it, so see a provider if you are unsure.

Can you run with shin splints? 

Usually not at full effort. OrthoInfo advises several weeks of rest from the activity that caused the pain, with swimming or cycling instead [1]. The NHS prefers gentle exercise over complete rest [6]. Either way, stop any exercise that brings on shin pain, and do not run through pain that is sharp, focused on one spot, or lingers afterward.

Does a stress fracture hurt when you press on it? 

Often, yes. Focal tenderness, meaning pain when you press one small spot on the bone, is a typical finding in stress fractures [3]. Shin splints tend to be tender over a wider stretch of the shin instead [3]. Swelling or bruising at the spot, or pain at night, adds to the concern [2]. A provider should check it.

Can an X-ray miss a stress fracture? 

Yes, especially early. In the AAFP review, a plain X-ray picked up only about 10% of stress fractures at first, rising to 30% to 70% after three weeks [3]. If your X-ray is clear but your provider still suspects a stress fracture, they may repeat it in two to three weeks or order an MRI [2][3].

How long do shin splints take to heal? 

The NHS says shin splints usually improve within a few weeks [6]. OrthoInfo says to be pain-free for at least two weeks before going back to exercise, then train less often, for shorter times and at lower intensity at first [1]. If pain has not improved after rest and treatment, see a provider to look for another cause [1].

Can shin splints turn into a stress fracture? 

The sources we read do not say that one becomes the other. Mayo Clinic notes that if shin pain becomes ongoing, it may point to a stress reaction or stress fracture [4]. Both come from repeated load on the shin, so continuing to run through worsening pain is risky. Get it checked rather than waiting.

Download the Loosn app for practical, plain-language tips on running, recovery and staying active. If you want guided help pacing your return, see how Loosn works and meet Kai, Loosn's AI physio coach.