Knee Pain Isn’t Always “Just Aging”: The Warning Signs, Treatments and Simple Changes Experts Say You Shouldn’t Ignore

Knee pain is easy to dismiss—especially when it starts gradually. A little stiffness after waking up, discomfort while climbing stairs or an occasional ache after exercise can seem like a normal part of getting older.

But experts say knee pain can have many different causes, and the right treatment depends heavily on what is actually happening inside the joint.

A recent CNA Lifestyle report, based on an article originally published by The New York Times, notes that the knees are the second-most common site of chronic pain after the back. Osteoarthritis is a major cause of persistent knee pain, particularly among older adults, but overuse injuries, meniscus tears and ligament injuries can affect people of different ages and activity levels.

The good news: knee pain does not automatically mean surgery.

WHY YOUR KNEES MAY BE HURTING

One of the most common causes of chronic knee pain is osteoarthritis, a condition in which the cartilage that cushions the joint gradually deteriorates. It can cause pain, stiffness and occasional swelling, with symptoms sometimes becoming worse over time.

But arthritis isn't the only explanation.

For people who exercise regularly, suddenly increasing workout intensity, distance or frequency can trigger overuse injuries. Runner's knee, for example, can cause pain underneath the kneecap, while iliotibial band syndrome can produce pain along the outside of the knee. Muscle weakness, alignment problems and previous injuries can also contribute.

A sudden twisting movement, fall or sports injury can cause a meniscus tear or ligament injury. Meniscus injuries may produce sharp pain, swelling and difficulty bending the knee, while ligament injuries can cause instability or a popping sensation.

THE TREATMENT MAY NOT BE WHAT YOU EXPECT

For chronic knee pain, experts increasingly emphasize movement and strengthening rather than simply resting the joint.

Physical therapy can help identify weaknesses or movement patterns that may be contributing to pain. Strengthening the quadriceps, hamstrings, glutes, hips and surrounding muscles can improve support around the knee and reduce symptoms.

For people with osteoarthritis, international guidance also supports tailored therapeutic exercise, including muscle strengthening and aerobic activity. NICE recommends therapeutic exercise for people with osteoarthritis, with supervised sessions considered when appropriate.

Low-impact activities such as cycling, swimming and using an elliptical machine may be easier on painful knees while still allowing people to remain active.

WHAT ABOUT WEIGHT?

For people who are overweight, weight management can also make a meaningful difference.

The knee carries a substantial load with every step, and maintaining a healthy body weight can reduce stress on the joint. Arthritis Foundation guidance likewise lists weight loss as an important component of osteoarthritis management, particularly for people with knee or hip osteoarthritis.

Research summarized by the Arthritis Foundation has also found that losing 10% to 20% of starting body weight can improve pain, physical function and quality of life more than losing only 5% in people with arthritis.

That doesn't mean everyone with knee pain needs to lose weight. The appropriate approach depends on the person's overall health, body composition and medical circumstances.

DO PAINKILLERS AND INJECTIONS WORK?

Medication can sometimes help manage symptoms, but it isn't necessarily a long-term solution.

CNA's report notes that steroid injections may provide temporary pain relief, but frequent use is generally discouraged. Evidence for hyaluronic-acid injections is mixed, while platelet-rich plasma injections may help some patients with pain but have not been shown to regenerate damaged cartilage.

For osteoarthritis, clinical guidance also supports options such as topical non-steroidal anti-inflammatory drugs in appropriate patients.

People should speak with a doctor or pharmacist before taking anti-inflammatory medicines, particularly if they have other medical conditions or take other medications.

WHEN KNEE PAIN SHOULD NOT BE IGNORED

Not every painful knee requires urgent medical attention—but certain symptoms deserve prompt assessment.

Experts cited by CNA recommend seeking medical attention when the knee becomes unstable, pain is sudden and severe, walking becomes difficult or the problem is getting worse. Fever accompanying knee pain can also be a warning sign of infection. Persistent pain directly over a bone or pain that repeatedly disrupts sleep should also be evaluated.

Following an injury, rapid swelling, inability to bear weight, locking or repeated giving-way are additional reasons to seek medical assessment. CNA's more recent reporting on knee injuries also emphasizes that early evaluation of certain meniscus and ligament injuries can improve treatment options and potentially prevent further damage.

DON'T ASSUME KNEE PAIN MEANS KNEE REPLACEMENT

Perhaps the biggest misconception is that persistent knee pain automatically leads to surgery.

Experts say many people can manage knee problems through exercise, physical therapy, weight management, medication and other non-surgical approaches. Knee replacement is generally considered when significant symptoms persist despite appropriate treatments and the condition substantially affects quality of life.

And while supplements such as glucosamine and collagen are heavily marketed for joint health, previous CNA reporting found that knee specialists did not consider the evidence strong enough to routinely recommend these supplements for osteoarthritis.