Knee bursitis: what it is and what treatment can involve

Medically reviewed by a licensed physicianLast reviewed 2026-08-28

Most people who look this up have just been given a word — bursitis — and want to know two things: what it actually is, and what is usually done about it.

This page does not tell you what is causing your symptoms or what you should do about them. It cannot: that requires examining you. What it can do is explain what a bursa is, what would make the situation more urgent, and what treatment generally involves.

What a knee bursa is, and what bursitis means

A bursa is a small, fluid-filled sac that helps reduce friction between tissues that move against each other. There are several bursae around the knee, including ones near the kneecap and along the inner side of the joint. When one of these becomes irritated or inflamed, it is called bursitis.

Depending on which bursa is involved, swelling or tenderness may appear in different parts of the knee. Bursitis can be related to repeated pressure or activity, an injury, an underlying inflammatory condition, and in some cases infection.

The location of the symptoms and an examination help determine whether a bursa is actually the source of the problem.

When it is usually not an emergency — and what changes that

Knee bursitis does not automatically mean that something serious is happening, particularly when symptoms develop gradually and there is localized tenderness or swelling without fever, spreading redness, significant warmth or rapid worsening.

Those features change the assessment because an infected bursa needs medical evaluation and should not be treated as ordinary irritation. A rapidly worsening swollen, red or hot area around the knee, especially when accompanied by fever or feeling unwell, deserves prompt medical attention.

What makes it more concerning

Fever, spreading redness, rapid deterioration, or an acutely cold, pale or painful extremity.

Any of those means urgent medical attention, not a website.

With a bursa in particular, increasing redness, warmth, rapid swelling, fever or feeling unwell can raise concern for infection and should be medically evaluated.

What treatment can involve

This describes what is generally done. It does not prescribe anything for you, and none of it is a plan for your knee. The physician’s own description of the progression:

Reducing the activity or pressure provoking the area when appropriate, addressing inflammation and the underlying cause, physical therapy in selected cases, aspiration or injection in appropriate circumstances, and evaluation for infection when that is a concern.

Notice the shape of that list: it starts with what is causing the pressure, not with a procedure. And every step in it carries a condition — when appropriate, in selected cases, in appropriate circumstances. Those conditions are the part an article cannot decide for you.

What a physician looks for

This is the list the physician who reviews cases here asks for:

Which joint is involved, how long it has been a problem, what they have tried, what they have been told about surgery if anything, and whether imaging already exists.

With bursitis, what you have already tried matters more than usual, because the first steps are often about changing what is irritating the area.

What you can do next

Write down what puts pressure on that part of the knee. Kneeling, a particular chair, a particular activity. That is the information that gets used, and it is the part only you have.

Gather any imaging you already have. You do not need to obtain new studies before someone looks at your case.

If the area is becoming increasingly red, hot or swollen, or you have fever or feel unwell, seek medical evaluation rather than relying on this article.

If you are trying to understand what may be causing your knee symptoms or what options may be reasonable to discuss, you can request a medical review.

This page is general information and is not medical advice. It does not diagnose your condition, does not establish a physician-patient relationship, and is not a substitute for being examined.