Dr. Yi-Cheng Wu
中文

Acute and Chronic Bursitis: How to Tell Them Apart and What to Do

By Dr. Yi-Cheng Wu · Reviewed June 21, 2026

Bursitis is inflammation of the cushioning fluid sacs between bone and tendon. It can be acute or chronic, and most cases respond to treatment within a week.

Bursitis is inflammation of a bursa, a sac that sits between bone, tendon, muscle, and skin, from irritation. It can be superficial (such as at the olecranon of the elbow) or deep (such as subacromial). Acute cases are usually caused by injury, infection, or inflammation; chronic cases often come from long-term repetitive use, overuse, or an underlying tendon problem, and are more common in athletes and manual workers. Management focuses on protecting against microtrauma, controlling inflammation and pain, ice, compression and elevation, and exercise training. Some chronic cases may consider a local corticosteroid injection, with the benefit still depending on the specific site and a physician's assessment. If infection is suspected (marked redness, swelling, heat and pain, or fever), or if the condition recurs or does not respond to conservative treatment, early medical evaluation for aspiration and further work-up is advised.

Bursitis is inflammation of a bursa, a fluid-filled sac located between moving structures that cushions and reduces friction between bone, tendon, muscle, and skin, when the bursa becomes irritated. It can be divided into superficial bursitis (for example olecranon bursitis at the elbow) and deep bursitis (for example subacromial bursitis).

In its normal state a bursa contains only a very small amount of fluid, which reduces friction and allows painless movement during muscle contraction. Bursitis can be acute or chronic. Acute bursitis is usually caused by injury, infection, or inflammation. Chronic bursitis is mostly caused by long-term repetitive use or exercise, and chronic bursal swelling is often driven by a problem in the underlying tendon.

Epidemiology

  • One relevant statistic is that bursitis (from all causes) accounts for about 2 cases per 10,000 hospitalized patients each year, with an annual incidence of about 10 per 100,000 people, though the true figure may be higher.
  • It is most common in men aged 18 to 88, and 75% of cases are non-infectious.

Common types

  • Subacromial bursitis (shoulder)
  • Olecranon bursitis (elbow)
  • Prepatellar bursitis (knee)
  • Retrocalcaneal bursitis (heel)
  • Iliopsoas bursitis (hip)
  • Trochanteric bursitis (hip)
  • Ischial bursitis (buttock)

Pathophysiology

  • Direct injury
  • Prolonged pressure (for example an elbow resting on a desk for long periods)
  • Overuse
  • Immune-mediated crystals (for example gout)
  • Rheumatoid arthritis
  • Infection

Risk factors

  • Risk factors for infectious bursitis include:
    • A weakened immune system
    • Diabetes
    • Skin irritation or injury in the surrounding area
    • Hematoma
  • Risk factors for non-infectious bursitis include:
    • Trauma
    • Overuse
    • Any occupation associated with repeated trauma at a site: athletes, people doing physical or manual labor, and musicians

Physical examination

  • Local tenderness
  • Swelling
  • Reduced range of motion or pain on movement
  • Erythema or edema (seen in superficial bursitis)
  • Traumatic bursitis usually occurs after a traumatic event or overuse
  • Muscle atrophy (in chronic bursitis associated with restricted activity)

Diagnostic tools

  • Blood tests such as complete blood count (CBC), erythrocyte sedimentation rate (ESR), rheumatoid factor (RA), and serum uric acid.

  • Bursal fluid aspiration and synovial fluid analysis: cell count and differential, glucose and total protein, crystal detection, Gram stain, and culture.

  • Normal fluid: clear and yellow, containing 0 to 200 WBCs, 0 RBCs, reduced protein, and glucose equal to serum.

  • Traumatic bursitis: bloody or yellow fluid, with fewer than 2,000 WBCs, many RBCs, elevated protein, and normal glucose.

  • Infectious bursitis: cloudy yellow fluid, with more than 50,000 WBCs, few RBCs, slightly elevated protein, reduced glucose, and bacteria on Gram stain.

  • Rheumatoid and microcrystalline inflammation: yellow fluid that may be cloudy, containing more than 2,000 WBCs, few RBCs, slightly elevated protein, and variable glucose; crystals are identified with polarized light microscopy.

  • Chronic or recurrent bursitis should have acid-fast staining and culture on special media for tuberculosis, Brucella, and algae.

  • Gout shows monosodium urate crystals; pseudogout shows calcium pyrophosphate crystals.

  • X-rays are used to rule out other suspected pathology (such as fracture, dislocation, or a foreign body); an X-ray may show chronic arthritic changes, calcific deposits, or rheumatic features.

  • Ultrasound can be used to guide diagnostic aspiration or therapeutic injection.

  • Magnetic resonance imaging (MRI) helps confirm bursal or peribursal fluid, associated abscess, and nearby soft-tissue structures. It is not always needed for simple bursitis, but it is warranted when there is other tissue injury that needs further confirmation.

Initial treatment

  • Protective measures for non-infectious bursitis: use an elbow brace or padding to prevent microtrauma.

  • Modifying repetitive work or eliminating microtrauma helps in non-infectious bursitis.

  • A minority of acute bursitis cases are infectious; this is harder to diagnose, and the bursa should be aspirated as a priority.

  • In infectious olecranon bursitis, Staphylococcus aureus is the most common pathogen. A broad-spectrum antibiotic targeting Staphylococcus aureus is the preferred treatment.

  • Anti-inflammatory pain medication (NSAIDs): for example ibuprofen, used for pain relief and to reduce inflammation.

  • Corticosteroid injection: for patients with chronic bursitis, a corticosteroid injection can help reduce inflammation and relieve pain.

Additional treatment

  • Ice: apply an ice pack to superficial bursae for 20 minutes at a time to reduce swelling and pain.
  • Compression and elevation: help reduce swelling.
  • Exercise training: including stretching, strengthening, and maintaining range of motion.
  • Extracorporeal shockwave therapy (ESWT) or platelet-rich plasma (PRP) injection: these may help in stubborn cases, but in studies many cases responded well to corticosteroid treatment, and the useful approach appears to depend on the site of the bursitis. For example, for pes anserine bursitis at the knee, local corticosteroid injection ranked highest in the comparison shown below, while research on trochanteric bursitis at the hip supports a meaningful role for exercise.

Surgery

  • Surgical treatment of bursitis is relatively uncommon and is usually considered only after multiple conservative treatments have failed. Indications include adhesive bursitis, recurrent stubborn bursitis, and cases that severely limit joint movement.
  • Surgical approaches:
    • Bursectomy: removing the adherent bursa and releasing adjacent tissue
    • Open surgery: incising or releasing the iliotibial band and removing the bursa
    • Arthroscopic bursectomy

Follow-up

  • Most patients respond to treatment within a week.

  • Referral is advised for patients with recurrent acute flares, a need for repeated joint or bursal aspiration, or who ultimately need surgical removal of the bursa.

  • Follow-up for conservative management:

    • Follow up after 2 to 3 months to assess mobility and strength; for patients with persistent symptoms, reserve ultrasound or X-ray to guide the treatment plan.

  • Follow-up after surgery:

  • Return to daily activities 3 to 4 months after surgery, and to full activity after 6 months.

Prognosis

  • Most patients are symptom-free within 3 months or after conservative treatment, and 70% of patients are symptom-free within a year of onset.
  • 30% of patients have symptoms that persist for years; of these, 66% improve after aspiration or extracorporeal shockwave therapy, and the 10% who still have symptoms are referred for surgery.

References

  • Adv Orthop. 2023 Sep 30:2023:5545520
  • Physiotherapy. 2024 Jun:123:69-80.

Frequently asked questions

How long does bursitis usually take to get better?

According to this article, most patients respond to treatment within a week, and about 70% are symptom-free within a year of onset. A minority have symptoms that persist for years and need further management.

Does bursitis always require a steroid injection?

Not necessarily. Early on, management usually centers on protection, controlling inflammation and pain, ice, compression and elevation, and exercise training. Local corticosteroid injection is considered mainly in chronic cases, and the benefit should be assessed for each site individually. For example, research on trochanteric bursitis at the hip supports a role for exercise.

When should bursitis be seen by a doctor promptly?

When infectious bursitis is suspected (harder to diagnose, and aspiration should be prioritized), or when there are recurrent acute flares, a need for repeated aspiration, or conservative treatment has not worked, this article suggests referral for evaluation.

Who is more likely to develop bursitis?

Non-infectious bursitis is common in athletes, manual or physical laborers, musicians, and others with repeated trauma at a given site. Risk factors for infectious bursitis include a weakened immune system, diabetes, and skin damage.

Does bursitis always need an X-ray or MRI?

Not necessarily. Simple bursitis does not always require an MRI. X-rays are used mainly to rule out other pathology such as fracture or dislocation, and imaging is arranged when there is associated soft-tissue injury that needs further confirmation.

This article is also available in the original Chinese, with the full reference list.

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