Hearing or feeling a clicking, popping, or cracking sensation in your knee can be unsettling, especially if it occurs frequently when walking upstairs, squatting, or standing up from a chair. Many people worry that these sounds mean something is wrong or that damage is developing inside the joint.

The good news is that knee clicking without pain is extremely common and, in most cases, completely normal. Orlin & Cohen’s Kim Leogrande, PTA, is here to help you understand why it happens, ease concerns, and clarify when it may be time to seek professional care.

What causes knee clicking without pain?

Gas bubbles in the joint

One of the most common causes of painless knee clicking is the movement of gas bubbles within the synovial fluid that lubricates the joint. As pressure changes during movement, tiny bubbles can form and then release, creating a popping or clicking sound. This is similar to cracking your knuckles and does not indicate joint damage or injury.

Tendons and ligaments moving over bone

Another frequent cause is the movement of tendons or ligaments over bony structures as the knee moves. These soft tissues can shift position temporarily, especially during activities such as squatting or climbing stairs. When they snap back into place, a clicking sound may be heard. This type of clicking is usually harmless when it isn’t accompanied by pain, swelling, or instability.

When Knee Clicking Is Completely Normal

If your knee clicks but feels otherwise normal, it’s usually nothing to worry about. Painless clicking that occurs without swelling, stiffness, or a sense that the knee may give way is generally considered part of normal joint mechanics. Many active individuals, such as runners, athletes, and gym-goers, notice knee noises because their joints move frequently under load.

Age can also play a role. As we age, subtle changes in cartilage and joint surfaces are normal and may make clicking more noticeable. Importantly, joint noise alone does not mean your knee is damaged or that you need to stop exercising. In fact, staying active is often beneficial for overall knee health.

When Knee Noises May Signal a Problem

While painless clicking is often normal, certain accompanying symptoms may indicate the need for further evaluation. Clicking that occurs with pain, swelling, stiffness, or a limited range of motion may indicate an underlying issue. Sensations of catching, locking, or instability are also signs that shouldn’t be ignored.

If clicking begins suddenly after a fall, sports injury, or significant change in activity level, it’s worth having it assessed. These symptoms may indicate joint irritation or injury that could benefit from early treatment.

Conditions That Can Cause Abnormal Knee Clicking

In some cases, knee clicking may be associated with specific conditions. Meniscus irritation or tears can cause clicking or catching sensations, particularly when bending or twisting. Tendon overload or ligament strain may also cause abnormal joint sounds, especially when the knee is repeatedly stressed. Early joint changes, including cartilage wear, can sometimes cause noise when paired with discomfort or swelling.

It’s important to remember that these conditions are typically identified based on the full picture, not on sound alone. Pain, function, and stability are key factors in determining whether clicking is a concern.

Should you see an orthopedic doctor for knee clicking?

If knee clicking is painless and doesn’t affect how you move, treatment is often unnecessary. However, if clicking becomes persistent, painful, or interferes with daily activities or exercise, it may be time to consult an orthopedist.

An Orlin & Cohen, our fellowship-trained orthopedic specialists, can evaluate your knee, identify the cause, and recommend the right next steps. Book an appointment today so you can move with confidence and peace of mind.