Whether you're an athlete, an active adult, or simply enjoy walking around your neighborhood, knee pain can make everyday activities difficult.

The knee is one of the largest and hardest-working joints in the body. Every step, squat, climb, and pivot places stress on the joint. Because of this, knee pain can develop from sudden injuries, repetitive overuse, arthritis, or normal wear and tear.

While occasional soreness often improves with rest, persistent or worsening pain should never be ignored. Identifying the cause early may help prevent further damage and expand your treatment options.

Common Causes of Knee Pain

Several conditions can cause knee pain, ranging from mild inflammation to more significant joint injuries.

Osteoarthritis

Osteoarthritis is one of the leading causes of chronic knee pain, especially in adults over 50.

As cartilage wears down, the bones begin to rub together, causing:

• Pain during activity
• Morning stiffness
• Swelling
• Reduced flexibility
• Grinding or popping sensations

Meniscus Tears

The meniscus is a piece of cartilage that cushions the knee joint.

A sudden twist while walking, exercising, or playing sports can tear the meniscus.

Symptoms often include:

• Pain when twisting
• Swelling
• Locking of the knee
• Difficulty fully straightening the leg

Ligament Injuries

The ACL, MCL, PCL, and LCL are important stabilizing ligaments inside the knee.

These injuries commonly occur during sports, falls, or motor vehicle accidents.

You may notice:

• A popping sensation
• Immediate swelling
• Knee instability
• Difficulty bearing weight

Tendinitis

Overuse can inflame the tendons surrounding the knee.

Runner's knee and jumper's knee are common examples.

Pain often worsens with:

• Running
• Jumping
• Climbing stairs
• Squatting

Bursitis

Small fluid-filled sacs called bursae reduce friction inside the knee.

Inflammation of these sacs can cause:

• Localized swelling
• Tenderness
• Pain when kneeling
• Warmth around the joint

When Should You See a Specialist?

You should schedule an orthopedic evaluation if:

• Pain lasts longer than two to three weeks
• Your knee repeatedly gives out
• You cannot fully bend or straighten your knee
• Swelling continues despite rest
• Pain interferes with walking or sleeping
• You heard a pop during an injury
• Over-the-counter medications aren't helping

The earlier many knee conditions are diagnosed, the easier they are to treat.

How Is Knee Pain Diagnosed?

Your provider will begin with a physical examination and review of your symptoms.

Depending on the injury, diagnostic testing may include:

• Digital X-rays
• MRI
• Ultrasound
• Range-of-motion testing
• Strength evaluation

An accurate diagnosis helps determine the most effective treatment plan.

Treatment Options

Many knee conditions improve without surgery.

Treatment may include:

Physical Therapy

Strengthening the muscles surrounding the knee improves stability, reduces pain, and supports long-term joint health.

Read more: How Physical Therapy Helps Chronic Pain
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Activity Modification

Reducing high-impact activities while maintaining safe movement often helps decrease inflammation.

Medications

Anti-inflammatory medications may help reduce swelling and discomfort.

Joint Injections

For arthritis or chronic inflammation, corticosteroid or other image-guided injections may provide significant pain relief.

Surgery

Some ligament injuries, severe meniscus tears, or advanced arthritis may require orthopedic surgery when conservative treatments are no longer effective.

Can Knee Pain Go Away on Its Own?

Minor strains often improve with rest, ice, compression, and elevation.

However, persistent pain should not be ignored because untreated injuries can become more difficult to manage over time.

Early treatment often means a faster recovery and better long-term results.

Frequently Asked Questions

When should I worry about knee pain?

If pain lasts more than two to three weeks, causes instability, swelling, or difficulty walking, you should see a specialist.

Can arthritis cause knee pain?

Yes. Osteoarthritis is one of the most common causes of chronic knee pain.

Why does my knee hurt when climbing stairs?

Pain while climbing stairs may be caused by arthritis, patellofemoral pain syndrome, tendinitis, or cartilage injuries.

Do I need an MRI?

Not always. Many knee problems can be diagnosed during a physical examination, although MRI is often helpful for ligament and cartilage injuries.

Can physical therapy help knee pain?

Yes. Physical therapy is frequently recommended to improve strength, flexibility, and joint stability.

Are knee injections safe?

When performed appropriately, knee injections are a common treatment for arthritis and inflammation.

Will I need surgery?

Many patients recover without surgery. Treatment depends on the severity of the injury and your individual goals.

What doctor treats knee pain?

An orthopedic specialist is trained to diagnose and treat injuries and conditions affecting the knee joint.