Why Does My Achilles Hurt When I Run?

Why Does My Achilles Hurt When I Run?

If your Achilles starts hurting when you run, you’re not alone. Achilles pain is one of the more common overuse problems affecting active adults, especially runners who have recently increased their mileage, speed, hill work, or training frequency.

The Achilles tendon connects your calf muscles to your heel bone and plays an important role every time you push off the ground. Because it absorbs and transfers a significant amount of force during running, repeated stress can eventually cause irritation, pain, and reduced tolerance to activity.

The good news is that Achilles pain doesn’t necessarily mean you have to stop being active altogether. Understanding why the pain is happening—and addressing the underlying problem early—can help you return to running more comfortably.

 

What Causes Achilles Pain When Running?

Achilles pain is often related to the tendon being exposed to more load than it can currently tolerate.

This can happen after a sudden change in your training, such as:

  • Increasing your weekly mileage too quickly

  • Adding sprinting or speed workouts

  • Running more hills

  • Returning to running after a long break

  • Increasing the number of training days

  • Changing running surfaces

  • Wearing different shoes

  • Adding other high-impact activities to your routine

Your muscles, tendons, and other tissues need time to adapt when your activity level changes. If the demands placed on the Achilles increase faster than the tendon can adapt, symptoms may develop.

Sometimes, however, Achilles pain appears even when your training routine hasn't changed significantly. Factors such as calf weakness, reduced ankle mobility, previous injuries, biomechanics, or simply accumulated training stress can also contribute.

 

What Does Achilles Tendon Pain Feel Like?

Achilles pain can vary depending on the person and how irritated the tendon is.

Some runners notice pain or stiffness first thing in the morning or when taking their first few steps after sitting. Others mainly experience discomfort during running, jumping, or pushing off.

Common symptoms include:

  • Pain or stiffness at the back of the ankle

  • Tenderness along the Achilles tendon

  • Pain when running or accelerating

  • Stiffness after exercise

  • Discomfort when walking uphill or upstairs

  • Swelling or thickening around the tendon

  • Pain that becomes more noticeable as training continues

One important point is that Achilles pain can sometimes improve temporarily once you warm up. That doesn't necessarily mean the tendon is fully recovered. If symptoms repeatedly return after running, it's worth having the problem evaluated rather than simply pushing through it.

 

Should You Keep Running With Achilles Pain?

This depends on the severity of your symptoms and how your Achilles responds to activity.

For some runners with mild symptoms, completely stopping all activity may not be necessary. Instead, reducing running volume or temporarily modifying higher-impact activities can help decrease the load on the tendon while maintaining general fitness.

However, continuing to run through progressively worsening pain is usually not a good strategy.

A useful question is not simply, “Does it hurt while I run?” but also, “How does my Achilles respond afterward and the next morning?”

If pain and stiffness consistently increase after running or the following day, your current training load may be exceeding what the tendon can tolerate.

A physical therapist can help determine an appropriate activity level and build a progressive plan based on your symptoms and goals.

 

How Is Achilles Tendon Pain Treated?

Treatment depends on the specific cause, severity, and duration of your symptoms.

For many runners, rehabilitation focuses on gradually improving the tendon’s ability to tolerate load. This may include progressive strengthening of the calf and lower leg, mobility work when appropriate, running modifications, and a gradual return to higher levels of activity.

The goal isn't simply to make the pain disappear temporarily. It's to help the tendon become stronger and better able to handle the demands you're asking of it.

At Kinetic Physical Therapy & Wellness, treatment can also include Shockwave Therapy when clinically appropriate. Shockwave therapy uses focused mechanical energy to stimulate a biological response in the treated tissue and may be incorporated into a broader rehabilitation program for persistent tendon problems.

Shockwave therapy isn't necessarily the only treatment needed, and it's not appropriate for every person. Your physical therapist can assess your condition and determine whether it makes sense as part of your treatment plan.

 

When Should You See a Physical Therapist?

If Achilles pain keeps coming back, affects your running, or isn't improving with reasonable activity modification, an evaluation can help identify what's contributing to the problem.

A physical therapist can assess factors such as:

  • Calf strength and endurance

  • Ankle mobility

  • Running and movement mechanics

  • Training load

  • Previous injuries

  • The tendon’s ability to tolerate progressively higher loads

This can help you understand not only where the pain is coming from, but also why your Achilles may be struggling with your current activities.

Kinetic also provides resources and care for Achilles and patellar tendon pain, making it possible to approach tendon problems with a rehabilitation-focused strategy rather than simply treating symptoms.

 

Don't Ignore Persistent Achilles Pain

Achilles pain when running is often a sign that your tendon is having difficulty keeping up with the demands being placed on it. Ignoring the problem and repeatedly pushing through worsening symptoms can make returning to your normal training more difficult.

On the other hand, you don't necessarily have to give up running permanently.

With the right assessment, appropriate load management, progressive strengthening, and—when indicated—treatments such as Shockwave Therapy, many runners can work toward returning to the activities they enjoy.

If your Achilles has been hurting every time you run, don't wait until the pain starts limiting everything else you do. A physical therapy evaluation can help you understand what's happening and determine the next step toward getting back to running.