Quick version
Periosteitis is a common overuse injury that occurs when the shinbone is exposed to more impact than the tissues have time to repair. The condition is characterized by a dull tenderness along the inside of the shinbone that often "warms up" at the beginning of a workout, but worsens if the load continues. To recover, a balance is required between active relief - where running is temporarily replaced with non-impact activities such as cycling - and strengthening strength training. If the problems are long-lasting or recurring, it is important to also review the body's internal conditions, as deficiencies in nutritional intake and important substances such as vitamin D and iron can impair the healing ability of bone tissue.
Despite its name, shin splints, or medial tibial syndrome as it is called in medical parlance, is not an infection caused by bacteria or viruses. Instead, it is a mechanical overload reaction. When the lower leg is exposed to repeated impacts, the attachments for the muscles and the membrane that surrounds the shin bone can become irritated and inflamed.
The condition often affects people who quickly step up their training, start running on harder surfaces, or return to exercise after a longer break.
Typical symptoms – from warm-up pain to everyday pain
In the early stages, the pain is usually dull and located along the lower or middle part of the inside of the shin bone. A classic sign is that it initially "warms up" - it hurts at the start of the workout, but the pain subsides when the body warms up, only to return afterwards.
If training continues despite the warning signs, the symptoms often worsen:
The soreness spreads over an area several centimeters long along the edge of the leg.
The lower leg feels stiff and hurts when pressed.
The pain lingers in everyday life, for example when you walk up stairs or get up after resting.
Important to distinguish from stress fracture: In periostitis, the soreness is usually spread over a larger area. If the pain is instead sharply limited to a single point, hurts at rest at night or makes it impossible to walk normally, it may be a stress fracture (a crack in the bone). It requires a different type of relief and medical assessment.
Why does it happen?
The triggering factor is almost always an imbalance between load and recovery. It is rarely a single movement, but rather the effect of many impacts over time where the tissue has not had time to repair itself.
External factors such as worn shoes, hard surfaces and rapid increases in training volume play a major role. At the same time, the risk is affected by your body's biomechanics - for example, reduced mobility in the ankle, weakness in the calf or hip muscles and flat feet.
The body's internal conditions
Something that is often forgotten when it comes to recurrent periostitis is the body's internal recovery ability. If you keep getting pain even though you have changed shoes and adjusted your training, the reason may be that your body lacks important building blocks for repairing bone tissue and muscles.
Levels of Vitamin D and calcium affect the density and strength of the skeleton, while iron deficiency and low energy levels impair muscle oxygenation and recovery. In the case of long-term problems, a blood test or a health check can provide valuable answers as to whether your body has the nutritional conditions required to withstand stress.
Treatment and the way back
Treatment is rarely about total silence on the couch, but about smart load management. The goal is to reduce irritation in the periosteum without losing your fitness.
Active unloading: Pause running, jumping and impact loading. Replace with gentle activities such as cycling, swimming or water running.
Strengthen the area: Physiotherapy with a focus on ankle and calf mobility and strength for the feet, calves, hips and core will relieve the shinbone in the long term.
Gradual return: When you can walk at a brisk pace without pain, you can carefully start with short running intervals. A useful rule of thumb is not to increase the amount of exercise by more than about 10 percent per week. If the pain returns, you have progressed too quickly.
How long does it take to get better and when can you start exercising again?
Many people get better within a few weeks, but the recovery time varies depending on how long the symptoms have been present, how much strain has been applied and whether there are any remaining risk factors. Some can return gradually after three to four weeks, while others need significantly longer rehabilitation, especially if the pain has been ignored for a long time or if there are signs of a more pronounced strain injury.
A safe return is based on function, not calendar days. First, normal walking should work without pain. After that, you can add short, controlled running intervals and increase the amount gradually, often starting with less than half the previous training volume and then gradually progressing. A frequently used rule of thumb is to increase the load by about 10 percent per week, but it must be adapted to the individual's symptoms.
It helps to follow the body's signals systematically. If the pain returns during the session, remains the next day or gradually advances its onset, the escalation is going too quickly. In that case, the right strategy is to back off a step instead of pushing through.
The lower leg often tells you how the rest of the body is feeling. Anyone who repeatedly gets periostitis despite new shoes and training adjustments sometimes needs to look more broadly: sleep, energy intake, iron levels, vitamin D, recovery and total load over the week. This often explains why the tissue is not responding as it should.
