Knee Pain When Running? Causes and Treatment Options

Running is one of the most accessible ways to stay active, improve cardiovascular fitness, and support overall health. But when knee pain when running starts to interfere with your workouts, it can be frustrating and concerning. Some runners experience occasional soreness after a challenging workout, while others develop pain that returns every time they run.

Understanding what may be causing your knee pain is the first step toward addressing it. Knee pain can result from training habits, muscle weakness, overuse, previous injuries, or problems involving the knee joint and surrounding tissues.

At Vertex Sports Medicine, sports medicine professionals can evaluate activity-related injuries and help patients develop individualized treatment and recovery plans.

Why Does My Knee Hurt When I Run?

Running places repetitive stress on the knees. Your knees absorb impact and help transfer forces between your feet and hips with every stride. When training volume increases too quickly or your body cannot adequately handle the workload, irritation and pain may develop.

Knee pain can occur in different areas, including the front, sides, or back of the knee. The location and characteristics of the pain can provide clues about the potential cause.

Common causes include overuse injuries, patellofemoral pain, iliotibial band irritation, tendon problems, and injuries involving cartilage or ligaments.

Let's look at some of the most common causes.

1. Runner's Knee

One of the most common causes of knee pain in runners is often referred to as runner's knee, or patellofemoral pain syndrome.

This condition typically causes pain around or behind the kneecap. You may notice discomfort while running, climbing stairs, squatting, or sitting for extended periods.

Several factors may contribute to runner's knee, including:

• Increasing mileage too quickly
• Muscle weakness
• Changes in running surfaces
• Poor movement mechanics
• Repetitive stress
• Inadequate recovery

Treatment often begins with modifying activities that aggravate the pain. A healthcare professional may also recommend strengthening exercises for the hips and legs, flexibility work, and a gradual return to running.

2. Iliotibial Band Syndrome

If you experience pain on the outside of your knee, iliotibial band syndrome (ITBS) may be one possible cause.

The iliotibial band is a strong band of connective tissue that runs along the outside of the thigh. Repetitive bending and straightening of the knee during running can contribute to irritation in this area.

ITBS is particularly common among runners who suddenly increase their mileage or frequently run downhill.

Treatment may involve temporarily reducing running, addressing training errors, strengthening the hip and glute muscles, and gradually returning to activity.

3. Patellar Tendon Problems

The patellar tendon connects the kneecap to the shinbone and plays an important role in straightening the knee.

Repeated jumping, running, or other high-impact activities can place stress on the tendon. Pain is often felt below the kneecap and may become more noticeable during activities such as running, jumping, or squatting.

Treatment depends on the severity and underlying cause. It may include activity modification, progressive strengthening, and rehabilitation under professional guidance.

4. Osteoarthritis and Joint-Related Problems

Although arthritis is more commonly associated with aging, joint-related knee problems can affect people of different ages, particularly those with previous injuries or certain risk factors.

Knee osteoarthritis can cause pain, stiffness, swelling, and reduced mobility. Running may aggravate symptoms in some individuals.

If your knee pain is accompanied by persistent stiffness, swelling, or reduced range of motion, a professional evaluation can help determine what is contributing to your symptoms.

5. Previous Knee Injuries

A previous knee injury can sometimes contribute to ongoing or recurring pain.

For example, an old ligament, meniscus, or cartilage injury may affect how the knee functions during physical activity. Returning to running before fully rebuilding strength and mobility can also increase the risk of continued problems.

If your knee pain started after a previous injury or continues long after an injury appeared to heal, consider having it evaluated by a sports medicine professional.

How Training Habits Can Contribute to Knee Pain

Sometimes the problem isn't running itself but how you are training.

A sudden increase in mileage, intensity, or frequency can place more stress on your body than it is prepared to handle.

For example, if you normally run 10 miles per week and suddenly increase to 20 miles, your cardiovascular system may feel capable of handling the workload while your muscles, tendons, and joints need more time to adapt.

Other training factors that may contribute to knee discomfort include:

• Increasing speed too quickly
• Adding hills suddenly
• Running on unfamiliar surfaces
• Insufficient rest
• Repeating high-intensity workouts
• Returning to running too quickly after an injury

Gradually progressing your training can give your body more time to adapt.

What Should You Do If Your Knee Hurts While Running?

If your knee starts hurting during a run, don't automatically try to push through it.

Depending on the severity of the symptoms, consider reducing or stopping the activity that causes pain. Continuing to run through significant or worsening pain may make the problem more difficult to manage.

For mild soreness, temporary activity modification and recovery may help. However, persistent or recurring pain should be evaluated.

A sports medicine professional can help determine whether your symptoms are related to an overuse injury, movement problem, tendon irritation, joint condition, or another issue.

Treatment Options for Running-Related Knee Pain

Treatment depends on the specific cause of your knee pain.

Activity Modification

Reducing or temporarily avoiding activities that trigger pain can give irritated tissues time to recover. You may be able to stay active through lower-impact activities if they do not cause discomfort.

Physical Therapy

Physical therapy is commonly used for many running-related injuries. A physical therapist can develop exercises designed to improve strength, flexibility, balance, and movement mechanics.

Strengthening the hips, glutes, quadriceps, and other supporting muscles may help improve how forces are distributed through the lower body.

Progressive Strength Training

Returning to running isn't only about being pain-free. Your muscles and supporting tissues also need to be prepared for the demands of running.

A progressive strengthening program can help rebuild capacity and support a gradual return to your normal routine.

Running Technique Assessment

In some cases, evaluating running mechanics may help identify movement patterns that contribute to excessive stress on the knee.

A qualified professional can assess your running form and provide recommendations when appropriate.

Medication or Other Treatments

Depending on the diagnosis, a healthcare professional may recommend medication or other treatments to help manage pain and inflammation.

Treatment should be based on the underlying condition rather than simply masking symptoms.

How Can You Prevent Knee Pain While Running?

While injuries cannot always be prevented, several strategies may reduce your risk.

Increase Mileage Gradually

Avoid dramatic increases in running distance or intensity. Give your body adequate time to adapt.

Warm Up Before Running

A proper warm-up can prepare your muscles and joints for activity. Consider walking or performing dynamic movements before beginning a harder workout.

Strengthen Your Legs and Hips

Strength training can complement your running program by improving muscular capacity and stability.

Allow Recovery Time

Rest days are an important part of a training program. Your body needs time to recover and adapt after demanding workouts.

Pay Attention to Persistent Symptoms

Don't ignore pain that repeatedly appears during or after running. Early evaluation may help prevent a minor problem from becoming a larger one.

When Should You See a Sports Medicine Doctor?

Occasional mild soreness after an unusually demanding workout may improve with rest. However, you should consider seeing a sports medicine professional if:

• Your knee pain continues for several days or weeks
• Pain repeatedly returns when you run
• Your knee becomes swollen
• You have difficulty walking or putting weight on the leg
• Your knee feels unstable or gives way
• You experience locking or catching
• Pain interferes with sleep or daily activities
• You have suffered a significant knee injury

Severe pain, major swelling, an obvious deformity, or inability to bear weight after an injury warrants prompt medical evaluation.

Don't Let Knee Pain Stop You From Staying Active

Running should be a rewarding part of an active lifestyle, but persistent knee pain when running should not be ignored. Whether the problem is related to overuse, training changes, muscle weakness, tendon irritation, or a previous injury, understanding the underlying cause is essential for choosing the right treatment.

With proper evaluation, rehabilitation, and a gradual return to activity, many runners can get back to the activities they enjoy.

If you're experiencing knee pain, shoulder pain, back pain, or another sports-related concern, Vertex Sports Medicine can help you explore appropriate evaluation and treatment options. Getting professional guidance can help you understand your injury, manage symptoms, and work toward returning to your favorite activities safely.