Knee Pain: What Could Be Causing Your Discomfort?

Dr. Ole Olson
|
September 16, 2026

Table Of Contents

Your knees work hard every day. Walking, climbing stairs, getting out of a chair, exercising, and even simply standing all require the knee joint to support your body and move efficiently. When knee pain develops, activities you normally don’t think twice about can suddenly become uncomfortable.

Sometimes the cause is obvious, such as a sports injury or fall. Other times, knee discomfort seems to appear gradually without a specific injury.

Because the knee contains bones, cartilage, ligaments, tendons, muscles, and other tissues, pain can have many potential causes. Understanding where your discomfort comes from is an important first step toward determining what type of care may be appropriate.

At Asuta Health, we take an individualized approach to musculoskeletal pain by looking beyond the symptom itself and evaluating factors that may be contributing to how your knee feels and functions.

Understanding the Knee Joint

The knee is one of the largest joints in the body.

Three bones come together around the knee:

  • The femur, or thighbone
  • The tibia, or shinbone
  • The patella, or kneecap

Cartilage helps create smooth surfaces for movement, while the menisci help absorb and distribute forces through the joint.

Ligaments provide stability, tendons connect muscles to bones, and surrounding muscles help control movement.

A problem involving any of these structures may potentially contribute to knee pain.

What Are Common Causes of Knee Pain?

Knee pain isn’t a single condition.

Your symptoms may be related to an acute injury, repetitive stress, age-related changes, inflammation, movement patterns, or a combination of factors.

Some common causes include:

  • Osteoarthritis
  • Meniscus injuries
  • Ligament sprains or tears
  • Tendon problems
  • Bursitis
  • Patellofemoral pain
  • Sports injuries
  • Overuse
  • Previous injuries
  • Muscle weakness or imbalance

Where the pain occurs and which activities make it worse can provide helpful clues, but an evaluation is often needed to determine the underlying cause.

Knee Osteoarthritis

Osteoarthritis is a common cause of chronic knee pain, particularly as people get older.

Knee osteoarthritis involves changes throughout the joint, including cartilage and underlying bone.

Symptoms can include:

  • Aching knee pain
  • Stiffness
  • Swelling
  • Reduced range of motion
  • Grinding or creaking sensations
  • Pain with prolonged activity
  • Difficulty climbing stairs
  • Stiffness after sitting

Symptoms don’t always correlate perfectly with what appears on an X-ray. Some people have significant imaging changes with relatively mild symptoms, while others experience considerable discomfort.

Treatment should therefore consider both the joint and how the symptoms affect everyday function.

Meniscus Injuries

Each knee contains two menisci, which are C-shaped pieces of fibrocartilage located between the thighbone and shinbone.

The menisci help distribute loads and contribute to knee stability.

A meniscus can become injured during twisting or pivoting movements, particularly during sports. Degenerative changes can also make the meniscus more susceptible to tearing over time.

Possible symptoms include:

  • Pain along the joint line
  • Swelling
  • Clicking or catching
  • Difficulty fully bending or straightening the knee
  • Pain during twisting movements

Some meniscus injuries respond to conservative care, while others may require further orthopedic evaluation.

Ligament Injuries

Several major ligaments help stabilize the knee.

These include the:

  • Anterior cruciate ligament (ACL)
  • Posterior cruciate ligament (PCL)
  • Medial collateral ligament (MCL)
  • Lateral collateral ligament (LCL)

Ligament injuries commonly occur during sports, falls, sudden direction changes, or direct impacts.

Depending on the ligament and severity of the injury, symptoms may include pain, swelling, instability, or the feeling that the knee is giving way.

Significant instability after an injury deserves prompt evaluation.

Tendon-Related Knee Pain

Tendons connect muscles to bones.

Around the knee, repetitive stress can contribute to tendon irritation or degeneration.

Patellar tendinopathy, sometimes called jumper’s knee, affects the tendon connecting the kneecap to the shinbone.

It may be more common among people participating in activities involving frequent running or jumping.

Pain is often felt toward the front of the knee and may worsen with:

  • Jumping
  • Running
  • Squatting
  • Climbing stairs
  • Sports activities

Rest alone may temporarily reduce symptoms, but appropriate rehabilitation is often important for gradually restoring the tendon’s ability to tolerate activity.

Patellofemoral Pain

Pain around or behind the kneecap is often described as patellofemoral pain.

It may become noticeable during activities such as:

  • Running
  • Squatting
  • Going up or down stairs
  • Sitting with bent knees for extended periods
  • Kneeling

Several factors can contribute, including training changes, muscle strength, movement patterns, and joint loading.

Because there isn’t always one single cause, treatment often focuses on improving how the knee and surrounding areas function together.

What Is Knee Bursitis?

Bursae are small, fluid-filled sacs that help reduce friction around joints.

When a bursa around the knee becomes irritated or inflamed, it can cause pain, tenderness, or swelling.

Certain types of knee bursitis may develop after repetitive kneeling, direct pressure, overuse, or injury.

The appropriate treatment depends on which bursa is involved and why it became irritated.

Can Overuse Cause Knee Pain?

Yes.

Knee pain doesn’t require a dramatic injury.

Sometimes symptoms develop when the amount of stress placed on the knee increases faster than the tissues can adapt.

For example, you might develop pain after:

  • Suddenly increasing running mileage
  • Beginning a new workout program
  • Adding more hills to your walks or runs
  • Increasing squat or lunge volume
  • Returning to sports after time away
  • Spending significantly more time on your feet

This doesn’t necessarily mean you’ve seriously damaged your knee.

It may indicate that your current activity level has exceeded what the tissues are prepared to tolerate.

Gradual progression can help reduce the risk of overuse-related problems.

Why Does My Knee Hurt When I Go Up or Down Stairs?

Stairs place increased demands on the knee joint and surrounding muscles.

Pain during stair climbing may occur with several conditions, including patellofemoral pain, osteoarthritis, tendon problems, or other musculoskeletal issues.

The location of the discomfort and whether going up or down is more difficult can provide additional information.

Rather than avoiding stairs indefinitely, treatment may focus on identifying the cause and improving strength, mobility, and load tolerance when appropriate.

Why Does My Knee Hurt When I Squat?

Squatting requires coordinated movement through the knees, hips, and ankles.

Pain while squatting may be related to:

  • Patellofemoral pain
  • Tendon irritation
  • Meniscus problems
  • Osteoarthritis
  • Limited ankle or hip mobility
  • Training errors
  • Previous injuries

Squatting itself isn’t automatically harmful to the knees.

In fact, appropriately performed squatting movements can be useful for building lower-body strength.

If squatting consistently causes pain, an evaluation can help determine what may need to be modified.

Can Your Hips or Ankles Contribute to Knee Pain?

The knee doesn’t function in isolation.

Movement at the hips and ankles can influence the forces traveling through the knee.

For example, limited ankle mobility or reduced hip strength may affect movement during walking, running, squatting, or jumping.

That doesn’t mean knee pain is always caused by another joint.

However, evaluating the entire lower extremity can provide a more complete picture than examining only the painful area.

Can Muscle Weakness Contribute to Knee Problems?

Muscles surrounding the hips and knees help absorb forces and control movement.

Reduced strength may contribute to certain types of knee pain or make everyday activities more difficult.

Depending on the diagnosis, strengthening programs may focus on areas such as the:

  • Quadriceps
  • Hamstrings
  • Gluteal muscles
  • Calves
  • Hip stabilizers

Exercise selection should be based on the individual’s condition and abilities.

Can Previous Injuries Cause Knee Pain Years Later?

Previous injuries may influence knee health long after the initial pain disappears.

A history of significant ligament, meniscus, or other joint injury can increase the likelihood of developing certain changes later in life.

Old injuries may also lead to compensatory movement patterns or reduced strength if rehabilitation wasn’t completed.

If you’re experiencing new knee pain, tell your provider about previous injuries—even if they occurred many years ago.

Why Does My Knee Feel Stiff After Sitting?

Some people experience stiffness or discomfort when they first stand after sitting for an extended period.

This may occur with knee osteoarthritis and other joint conditions.

Gentle movement may help the knee feel less stiff after you’ve been moving for a few minutes.

Persistent or worsening stiffness should be evaluated, particularly if it’s accompanied by swelling or reduced range of motion.

What Does Knee Swelling Mean?

Swelling indicates that fluid has accumulated in or around the knee.

It can occur after an acute injury, repetitive stress, arthritis, bursitis, or other conditions.

Sudden significant swelling after an injury deserves evaluation, particularly if you’re unable to bear weight or move the knee normally.

A knee that becomes hot, red, and swollen—especially when accompanied by fever—requires prompt medical attention because infection is one possible cause.

What About Clicking and Popping?

Knees can make noises without anything being seriously wrong.

Clicking, cracking, or popping without pain isn’t necessarily a sign of injury.

However, sounds accompanied by pain, swelling, locking, catching, or instability deserve closer attention.

The symptoms occurring alongside the noise are generally more important than the noise itself.

Why Does My Knee Keep Giving Out?

A sensation that the knee is giving way may occur because of ligament instability, muscle weakness, pain inhibition, or other problems.

Repeated episodes shouldn’t simply be ignored.

If your knee feels unstable—particularly after an injury—an evaluation can help determine which structures may be involved.

When Is Knee Pain an Emergency?

Seek prompt medical attention if you experience:

  • Severe pain after a significant injury
  • An obvious deformity
  • Inability to bear weight
  • Significant sudden swelling
  • A locked knee
  • Severe instability
  • Redness and warmth accompanied by fever
  • Significant calf swelling or pain
  • New numbness or weakness

These symptoms may require more urgent evaluation than routine musculoskeletal discomfort.

How Is the Cause of Knee Pain Diagnosed?

Understanding knee pain typically begins with a conversation about your symptoms.

Your provider may ask:

  • When did the pain begin?
  • Was there an injury?
  • Where does it hurt?
  • Which movements make it worse?
  • Does the knee swell?
  • Does it lock or give way?
  • Have you injured the knee before?
  • What activities do you regularly perform?

A physical examination may then evaluate range of motion, strength, stability, tenderness, and movement.

Imaging may be recommended depending on the suspected condition.

What Are the Treatment Options for Knee Pain?

Treatment depends on what’s causing the pain.

Conservative options may include:

  • Activity modification
  • Therapeutic exercise
  • Strengthening
  • Mobility work
  • Rehabilitation
  • Manual or chiropractic care when appropriate
  • Changes to training or movement habits
  • Other non-surgical therapies

Certain patients may also be candidates for additional treatment options depending on their diagnosis and overall health.

The goal is to choose treatment based on the cause rather than simply treating every case of knee pain the same way.

Can SoftWave TRT Be Used for Knee Pain?

SoftWave Tissue Regeneration Technologies (TRT) uses acoustic waves applied to targeted areas of the body.

For selected musculoskeletal conditions, SoftWave TRT may be incorporated into a conservative treatment plan with the goal of supporting the body’s natural healing response and improving symptoms or function.

It isn’t appropriate for every cause of knee pain, and results vary.

An evaluation can help determine whether SoftWave TRT or another approach makes sense for your particular condition.

Should You Rest a Painful Knee?

It depends.

Short-term activity modification may be helpful after certain injuries or when an activity significantly aggravates symptoms.

However, completely avoiding movement for extended periods isn’t always beneficial.

For many musculoskeletal conditions, gradually restoring appropriate movement and strength is an important part of recovery.

The key is determining how much activity your knee can tolerate and progressively building from there.

Don’t Ignore Persistent Knee Pain

An occasional ache after an unusually active day may resolve on its own.

But knee pain deserves further attention when it:

  • Continues for several weeks
  • Keeps returning
  • Interferes with exercise
  • Makes stairs difficult
  • Limits walking
  • Causes swelling
  • Affects sleep
  • Causes instability
  • Prevents you from doing activities you enjoy

You don’t necessarily have to wait until pain becomes severe to have it evaluated.

Find the Cause of Your Knee Pain at Asuta Health

Knee pain can have many possible causes, from osteoarthritis and overuse to tendon problems, meniscus injuries, ligament damage, and movement-related factors.

That’s why understanding the source of your discomfort matters.

At Asuta Health, we take an individualized approach to musculoskeletal care. We’ll evaluate your symptoms, health history, movement, and functional goals to help determine what may be contributing to your knee pain and which conservative treatment options may be appropriate.

If knee pain is interfering with your everyday life, contact Asuta Health to schedule an evaluation and take the first step toward moving more comfortably.

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