Have you ever woken up with a swollen, painful elbow or a hip that just would not stop aching? You might have dismissed it as “just soreness” — but what if it is something more? Let us talk about bursitis, a condition that affects millions of people worldwide and yet is often misunderstood or overlooked.
What is Bursitis?
In the simplest terms, bursitis is the inflammation of a bursa. Now, what is a bursa? Think of it like a tiny water balloon — a small, fluid-filled sac that sits between bones, tendons, and muscles near your joints. Its whole job is to act as a cushion, reducing friction so your body moves smoothly. When that cushion gets angry and swollen, you get bursitis.
There are over 150 bursae scattered throughout the human body. The most commonly affected ones sit in the shoulder, elbow, hip, knee, and heel. It is not a rare condition at all. Studies suggest that bursitis accounts for a significant portion of musculoskeletal complaints in primary care settings, with subacromial bursitis (affecting the shoulder) being one of the most frequently diagnosed, particularly in adults over 40. It can affect anyone — from office workers to professional athletes.
How Does Bursitis Occur?
So what actually goes wrong inside the body? Under normal conditions, the bursa produces a small, consistent amount of fluid that keeps everything gliding. But when the bursa is repeatedly stressed, injured, or infected, the lining of the sac — called the synovial membrane — becomes irritated.
Once irritated, it responds by producing excess fluid. More fluid means more pressure. More pressure means pain and swelling. It is like overinflating a balloon inside a tight space — something has to give. Over time, if the inflammation is not addressed, the bursa wall can thicken and scar, making the condition chronic and harder to treat. In some cases, the bursa may even become infected, leading to what is known as septic bursitis, which carries its own set of complications.
What Are the Causes of Bursitis?
Bursitis does not just appear out of nowhere. There are clear, identifiable triggers that cause a bursa to become inflamed. The causes can range from something as simple as kneeling too long on a hard floor, to a bacterial infection spreading into the bursa. Understanding what causes it is the first step in preventing it. Here are the main culprits:
- Repetitive Mechanical Stress (Most Common — ~30–40% of cases)
This is the number one cause. Jobs or activities that require repetitive joint movements — like throwing, kneeling, or lifting — put continuous stress on the bursa. Over time, the repeated friction causes inflammation to build up. Plumbers, painters, and carpenters are classic examples of people at high risk. - Acute Trauma or Injury (~15–20% of cases)
A direct blow to a joint — falling on your knee or bumping your elbow hard on a desk — can trigger sudden bursal inflammation. It does not need to be a dramatic injury. Sometimes even a single, awkward movement is enough. - Infection (Septic Bursitis) (~10–15% of cases)
Bacteria, particularly Staphylococcus aureus, can enter the bursa through a skin break or spread from a nearby infection. Septic bursitis most commonly affects the prepatellar bursa (front of the knee) and the olecranon bursa (elbow). This type is particularly important to recognise because it needs antibiotic treatment. - Inflammatory Conditions (Gout, Rheumatoid Arthritis)
Crystal deposits from gout or the immune-mediated inflammation of rheumatoid arthritis can directly irritate the bursa. Gout-related bursitis often affects the elbow and knee, while rheumatoid nodules have been associated with intermetatarsal bursitis in the foot. - Idiopathic (Unknown Cause)
Sometimes bursitis just happens. No clear trigger, no trauma, no infection. In such cases, it is often linked to underlying metabolic or systemic factors that have not yet been fully identified.
Risk Factors for Bursitis
Not everyone who kneels on a hard floor will develop bursitis. So why do some people develop it while others do not? That comes down to risk factors — things that make your bursa more vulnerable to inflammation. Being aware of these risk factors can genuinely help you take preventive action before pain sets in.
- Age over 40 — As we age, tendons become less flexible and bursae become more susceptible to irritation.
- Occupational hazards — Jobs requiring repetitive kneeling, overhead lifting, or prolonged pressure on joints (e.g., carpet layers, painters, musicians).
- Obesity — Extra body weight increases pressure on the bursae, especially in the hip and knee regions.
- Diabetes mellitus — Linked to a higher risk of septic bursitis due to impaired immune function.
- Rheumatoid arthritis or gout — These inflammatory conditions create an environment where bursitis is more likely to develop.
- Immunocompromised states — Patients on steroids, chemotherapy, or those with HIV are at higher risk of infectious bursitis.
- Sports activities — Athletes involved in throwing sports, cycling, or running place repeated strain on specific bursae.
- Previous joint injury or surgery — Scar tissue and altered joint mechanics can increase bursal stress.
Symptoms of Bursitis
The symptoms of bursitis are hard to miss once you know what to look for. They tend to come on gradually — though in cases of trauma or infection, they can appear quite suddenly. Here is what most people experience:
- Localised Pain
The most telling sign. The pain is usually dull and aching at rest but sharpens with movement. It occurs because the inflamed bursa presses on surrounding nerves and tissues. In septic bursitis, the pain can be severe even without movement. - Swelling and Tenderness
The affected joint looks puffy. Pressing on it hurts. This happens because the bursa fills with excess fluid — sometimes visibly so, like the classic “lump” seen on an inflamed elbow (olecranon bursitis). - Limited Range of Motion
Moving the joint becomes stiff and painful. The inflamed bursa restricts normal gliding of surrounding structures. Shoulder bursitis, for instance, makes it hard to raise your arm above your head — something as simple as combing your hair becomes a challenge. - Warmth and Redness
Particularly in septic or gout-related bursitis, the skin over the bursa may feel warm to touch and appear red. This is a sign of active inflammation — the body’s immune response in full gear. - Fever (in Septic Bursitis)
When infection is involved, systemic symptoms like fever and chills may also appear. This is a red flag that requires prompt medical attention.
Differential Diagnosis
Here is where things get tricky. Bursitis does not exist in isolation — several other conditions can look and feel remarkably similar. Getting the diagnosis right matters enormously, because treating the wrong condition wastes time and can even make things worse. A thorough clinical evaluation is essential to differentiate bursitis from the following conditions:
- Rotator Cuff Tendinopathy / Tear
This is perhaps the most commonly confused condition with subacromial bursitis. Both cause shoulder pain, especially with overhead movements. However, rotator cuff pathology tends to show specific weakness patterns and a positive impingement test. Ultrasound imaging can effectively distinguish between the two. - Septic Arthritis
Infected bursitis and septic arthritis can both cause hot, swollen, painful joints with fever. The key difference? Septic arthritis involves the joint space itself, while septic bursitis is outside the joint. Joint aspiration and fluid analysis are critical for distinction. - Gout and Pseudogout
Crystal arthropathies can mimic bursitis closely — particularly gouty bursitis of the elbow or knee. Synovial fluid analysis showing urate or calcium pyrophosphate crystals confirms the diagnosis. - Rheumatoid Arthritis
RA causes joint inflammation with morning stiffness, but unlike bursitis, it typically affects multiple joints symmetrically. Elevated inflammatory markers (ESR, CRP) and positive rheumatoid factor help differentiate the two. - Cellulitis
Skin redness and warmth overlying a bursa can sometimes be mistaken for cellulitis. However, cellulitis spreads more diffusely and does not typically cause a discrete, fluctuant swelling.
How to Diagnose Bursitis?
A good clinician can often diagnose bursitis from history and physical examination alone. But is that always enough? Not always — and that is where investigations come in.
Ultrasound is widely considered the gold standard investigation for bursitis. It is non-invasive, inexpensive, and gives real-time images of the bursa. Ultrasound can show bursal distension, fluid accumulation, synovial thickening, and any associated tendon pathology. According to recent guidelines on shoulder ultrasonography, high-resolution ultrasound provides real-time visualisation of bursae while also enabling dynamic assessment and image-guided intervention — making it invaluable not just for diagnosis but also for treatment planning.
Other diagnostic tools include:
- MRI — Provides detailed soft tissue imaging, especially useful when ultrasound findings are inconclusive or when deeper bursae (like the iliopsoas bursa) are involved.
- Bursal fluid aspiration and analysis — This is critical when septic bursitis is suspected. The aspirated fluid is sent for cell count, culture, Gram stain, and crystal analysis. A white cell count exceeding 50,000 cells/mm³ strongly suggests infection.
- Blood tests — Full blood count, ESR, CRP, uric acid levels, and blood cultures help identify systemic inflammation or infection.
- X-ray — Rarely diagnostic for bursitis itself, but helps rule out fractures, calcifications, or underlying bone pathology.
Treatment of Bursitis
The good news? Most cases of bursitis respond well to treatment. The approach depends heavily on the cause and severity — there is no one-size-fits-all answer here. Infectious bursitis needs antibiotics. Inflammatory bursitis needs anti-inflammatory treatment. Chronic cases may need something more invasive. Let us break it down properly.
First-Line (Gold Standard) Treatment: Conservative Management
For the majority of non-infectious bursitis cases, the initial approach is PRICE therapy:
- Protection — Avoid activities that aggravate the bursa
- Rest — Reduce load on the affected joint
- Ice — Apply ice packs 15–20 minutes several times daily to reduce swelling
- Compression — Gentle compression can help manage swelling
- Elevation — Where possible, elevate the affected limb
NSAIDs (Non-steroidal anti-inflammatory drugs) such as ibuprofen or naproxen are the mainstay pharmacological treatment for pain and inflammation. They work well and are widely accessible.
Corticosteroid Injection
When conservative measures do not bring sufficient relief — usually after 4–6 weeks — a corticosteroid injection directly into the bursa is the next step. This provides rapid, targeted anti-inflammatory effect. Ultrasound guidance greatly improves the accuracy of these injections, reducing the risk of tendon injury and improving outcomes.
Antibiotic Therapy (for Septic Bursitis)
If infection is confirmed, oral or intravenous antibiotics targeting Staphylococcus aureus are started promptly. Mild cases may be managed with oral antibiotics (e.g., flucloxacillin or co-amoxiclav) in the outpatient setting, while severe cases require hospitalisation and IV antibiotics.
Physiotherapy and Rehabilitation
Once the acute inflammation settles, physiotherapy plays a crucial role. Strengthening the muscles around the affected joint, improving posture, and correcting biomechanical issues reduce the risk of recurrence. This step is often skipped — and that is exactly why so many people get bursitis again.
Surgical Intervention
Reserved for chronic, refractory cases that fail all conservative treatments. Bursectomy — surgical removal of the inflamed bursa — can provide lasting relief. It is typically performed arthroscopically (keyhole surgery) and has a good recovery profile. Newer interventional approaches, including percutaneous ultrasound-guided procedures, are also emerging as effective alternatives for difficult cases.
References
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