Costochondritis

Costochondritis is inflammation of the costochondral junctions (where a rib's cartilage meets the rib itself) or the costosternal junctions (where that cartilage meets the sternum), most often affecting the 2nd through 5th costochondral/costosternal junctions and usually involving more than one site, without visible swelling.^[1][2] It is a genuinely common presenting complaint: it accounts for roughly 6-13% of chest pain presentations in primary care and 13-36% of acute chest pain presentations overall depending on the care setting, and represents 20-50% of all chest-wall-pain diagnoses specifically.^[1][3] In adolescents presenting with chest pain, a musculoskeletal cause is found in about 31% of cases, with costochondritis itself accounting for roughly 13-14%.^[1][3]

This chapter is deliberately a companion to the separate Undifferentiated Chest Pain chapter, not a restatement of it. That chapter owns the single, universal, conservative red-flag screen every chest pain encounter needs before anything else — the "call 911 now" decision. This chapter begins only once that screen has been applied and cleared, and covers what happens next for the specific, common, benign diagnosis reached at the end of it: recognizing the classic reproducible-tenderness pattern, understanding Tietze syndrome as a distinct but related entity, and managing a condition whose entire evidence base for treatment remains genuinely limited.^[1]

The single most important safety point in this chapter, restated throughout: reproducible tenderness on palpation of the chest wall is a reassuring finding, but it does not, by itself, rule out a cardiac cause — particularly in a patient with cardiac risk factors. Costochondritis is a diagnosis of exclusion, not a diagnosis made purely from a positive palpation finding.^[3][1]

The classic pattern

The hallmark, and the single most useful diagnostic feature, is reproducible pain on direct palpation of the affected costochondral or costosternal junction(s) — pressing on the exact spot recreates the patient's presenting pain.^[3][1] The pain itself is typically sharp, aching, or pressure-like, most often bilateral or multifocal across several adjacent junctions rather than a single point, and is characteristically worsened by deep breathing, coughing, stretching, or upper body/arm movement.^[1] Two additional bedside maneuvers can help reproduce the pain: the crowing rooster maneuver (extending the neck while pulling both arms posteriorly and superiorly) and crossed-chest adduction (adducting the arm across the chest while rotating the neck to the same side).^[1] Onset is usually gradual, and a preceding antecedent illness with coughing, or recent unaccustomed or strenuous upper-body exercise, is common in the history.^[3]

Tietze syndrome — related, but a distinct entity

Tietze syndrome is frequently confused with costochondritis, but the two are genuinely different on exam and, to some degree, in who gets them. The defining difference is visible, palpable swelling: Tietze syndrome produces firm, sometimes warm, tender swelling localized to a single costochondral junction (most often the 2nd or 3rd rib), whereas costochondritis, by definition, involves no swelling and more often affects multiple junctions.^[1] Tietze syndrome also tends to have a more sudden onset (sometimes following an infection or minor trauma), can occur at any age but is most common under 40, and can show mild elevation of inflammatory markers (ESR/CRP) on testing — findings that are typically normal in isolated costochondritis.^[1] In practice, the distinction changes the differential to consider (any new or enlarging chest wall swelling deserves its own evaluation — see Red Flags & Refer) more than it changes first-line conservative management, which is similar for both.

Other conditions on the musculoskeletal chest-pain differential

• Slipping rib syndrome — hypermobility of an anterior rib tip (most often the 8th-10th, "false" ribs) that catches or slips beneath the rib above, producing a sharp, sometimes clicking or popping pain reproduced by a specific "hooking" maneuver (hooking fingers under the costal margin and pulling anteriorly) rather than direct costochondral palpation.^[3]
• Muscle strain — a clear history of recent lifting, forceful coughing, or unaccustomed exertion, with tenderness over muscle bellies (pectoralis, intercostals) rather than specifically at the costochondral junction.^[3]
• Fibromyalgia — chest wall tenderness can be one component of a much more widespread, diffuse pain syndrome; see the dedicated Fibromyalgia chapter if the pattern extends well beyond the anterior chest wall.^[1]
• Herpes zoster (pre-eruptive phase) — dermatomal, unilateral, band-like pain that precedes the characteristic vesicular rash by 1-5 days; reconsider if a rash develops in the following days.^[3]

• Most cases are idiopathic — no specific trigger is ever identified.^[2]
• An antecedent respiratory illness with a prominent cough, which repeatedly strains the costochondral junctions.^[3]
• Recent unaccustomed, repetitive, or strenuous upper-body exercise or activity (vigorous upper-extremity use, heavy lifting, rowing-type motions).^[2][3]
• Direct chest wall trauma.^[2]
• Peak incidence age 40-50 years, with a slight female predominance — Tietze syndrome, by contrast, occurs more often under age 40.^[1]
• An underlying seronegative spondyloarthropathy or other rheumatologic disorder.^[2]
• A history of breast cancer or other thoracic malignancy, or a thoracic tumour directly involving a costochondral junction — uncommon, but part of the reason new or progressive local swelling deserves its own workup rather than being assumed benign.^[2]
• Intravenous drug use, immunocompromise, or a recent sternotomy/thoracic surgical or central-line procedure — specific risk factors for the rare but genuinely serious infectious (septic) costochondritis, discussed further in Red Flags & Refer.^[2]

A clinical diagnosis of exclusion

There is no laboratory or imaging test that confirms costochondritis — the diagnosis rests on history and examination, made only after more serious causes have been reasonably excluded per the Undifferentiated Chest Pain chapter's screen and the red flags above.^[3][1] Examination should include palpation of each costochondral and costosternal junction to confirm reproducible tenderness, inspection specifically for swelling (favouring Tietze syndrome or an alternative diagnosis if present), auscultation of the heart and lungs, and assessment of the cervical spine and shoulder, since pain referred from either can mimic a chest wall origin.^[3]

A clinical prediction rule — a teaching aid, not a stand-alone test

One evidence-graded rule combines several history and exam features into a point score; a score of 6 or more is reported as 93% specific for costochondritis.^[1]

Given its high specificity but the platform's calculator-safety guardrail (this rule's design does not meet the bar for a live interactive calculator — see ClinicalGuidelineHtml), this table is provided as a structured teaching aid for organizing the history and exam, not as a stand-alone diagnostic test in place of the red-flag screen and clinical judgment above.^[1]

When to order an ECG or imaging

Patients older than 35 years, anyone with a personal history of or risk factors for coronary artery disease, and anyone with cardiopulmonary symptoms accompanying the chest pain should have a 12-lead ECG at minimum, and a chest radiograph should be considered, before the pain is attributed to costochondritis.^[3] Imaging (radiograph, ultrasound, or cross-sectional imaging) otherwise adds little in a straightforward, reproducible, multifocal presentation without red flags — it is typically normal in true costochondritis, and its main role is excluding an alternative diagnosis (infection, mass, rib fracture) when the presentation is atypical, when swelling is present, or when a red flag from the previous section is identified.^[2]

Differential diagnosis at a glance

• Confirm the diagnosis safely as one of exclusion — never reassure a patient as "just costochondritis" before the Undifferentiated Chest Pain chapter's red-flag screen has been applied and cleared.
• Relieve pain and restore normal activity, using the least aggressive effective conservative measures first, consistent with a condition whose treatment evidence base is genuinely limited.
• Set an honest, accurate expectation for the natural course — most patients improve substantially within about 3 weeks, though some tenderness can persist for months in a minority.
• Avoid both under-triage (missing a cardiac, infectious, or neoplastic cause) and over-treatment (repeated cardiac workup or escalating therapy for a confirmed benign, stable pattern).
• Recognize and separately manage the specific situations that are not simple idiopathic costochondritis — Tietze syndrome, slipping rib syndrome, and infectious costochondritis.
• Reduce unnecessary anxiety and repeat emergency visits through clear patient education about the condition's genuinely benign, self-limited nature.

• Reassurance and education — explicitly explain that costochondritis is a genuinely benign, self-limited inflammatory condition of the chest wall cartilage, not a sign of heart or lung disease, once that has been appropriately excluded; anxiety about the pain itself can otherwise drive repeat emergency visits.
• Activity modification — temporarily avoid or modify the specific movement, exercise, or repetitive activity that reproduces the pain (heavy lifting, certain upper-body exercise, forceful coughing where a cough suppressant may help break the cycle); this is not indefinite activity restriction, only until the acute inflammation settles.^[3]
• Local heat application — the conservative measure with the most consistent support across sources; a reasonable first adjunct alongside analgesia.^[1]
• Ice/cold application for an acute flare is a reasonable alternative some patients find more soothing than heat, though the evidence base specifically supporting cold over heat for costochondritis is not established — either is a low-risk trial.
• Cough suppression when a persistent cough is the specific perpetuating trigger.
• Targeted stretching physical therapy — reserve for symptoms persisting beyond about 1 year, where a small but real reduction in pain has been demonstrated; not needed as first-line therapy for a typical, briefer episode.^[1]
• Set explicit return precautions before ending any encounter — every red flag from the Undifferentiated Chest Pain chapter's screen, plus new fever or swelling at the site, plus pain that does not improve as expected with conservative treatment.

Pregnancy

Postural change and altered rib cage mechanics as pregnancy advances are a plausible contributor to chest wall discomfort, though costochondritis is not caused by pregnancy itself. Any new chest pain in pregnancy still needs the same triage principles as the Undifferentiated Chest Pain chapter's Special Populations section — new hypertension, headache, or visual changes raise concern for preeclampsia/HELLP, and pregnancy is an independent VTE risk factor — before a chest-wall-pain explanation is accepted. Preferred if analgesia is genuinely needed acetaminophen and local heat/activity modification. Avoid NSAIDs from approximately 20 weeks of pregnancy onward Health Canada has confirmed a risk of fetal renal impairment and low amniotic fluid (oligohydramnios) with NSAID use from about 20 weeks, and NSAIDs are contraindicated in the third trimester (beyond 28 weeks) for this reason.^[4] Topical diclofenac still carries systemic absorption and is subject to the same caution as oral NSAIDs in this window.

Breastfeeding

Acetaminophen and ibuprofen are considered compatible with breastfeeding at standard doses; confirm current specifics against each drug's own Drug Database entry.

Pediatrics and adolescents

Musculoskeletal causes are found in about 31% of adolescents presenting with chest pain, with costochondritis specifically accounting for roughly 13-14%, making it one of the more common benign explanations in this age group.^[1][3] The same conservative, weight-appropriate approach (acetaminophen or ibuprofen, activity modification, reassurance) applies; still apply the full red-flag screen rather than assuming benign musculoskeletal pain by default simply because the patient is young, particularly if there is a personal or family history of a cardiac condition.

Older adults

Baseline cardiac risk is higher in this group, so the threshold for ECG (already recommended at age 35 and older) and for a broader workup should be lower, and any reproducible tenderness finding should be interpreted with correspondingly more caution rather than as reassuring on its own.^[3]

Immunocompromised patients, people who inject drugs, and recent sternotomy/thoracic procedure

These are the specific populations at meaningfully higher risk of infectious (septic) costochondritis rather than the idiopathic form — maintain a lower threshold for imaging, culture, and prompt medical referral if fever, warmth, erythema, or fluctuance accompanies the chest wall pain, rather than defaulting to the conservative ambulatory pathway in this chapter.^[2]

Renal and hepatic impairment

Use NSAIDs cautiously or avoid them in significant renal impairment given the risk of further renal injury, and reduce the acetaminophen total daily dose in significant hepatic impairment. Topical NSAIDs and lidocaine patches carry minimal systemic absorption and are reasonable alternatives when oral NSAID use is a concern.

Set the follow-up interval around the expected natural course: most patients experience substantial improvement within about 3 weeks of rest and anti-inflammatory therapy.^[2] A follow-up contact or visit at 2-3 weeks is reasonable to confirm the expected trajectory and to reassess the diagnosis if it is not being met.

Counsel explicitly that persistent mild tenderness at 1 year is a known part of the natural course for a minority of patients — roughly one-third in one series — and does not by itself mean treatment has failed or that the diagnosis needs to be reconsidered, provided the pain is stable, non-progressive, and not accompanied by any new feature.^[3] Recurrence is possible; one series reported a recurrence rate of about 4% at 2 years, so counsel the patient on what to do if the same reproducible pattern returns (a repeat trial of the same conservative approach is reasonable, without needing to repeat a full cardiac workup, provided nothing about the pattern has changed).^[1]

For a patient with Tietze syndrome, specifically confirm the swelling is stable or resolving at follow-up rather than enlarging. For a patient started on physical therapy or referred for a corticosteroid injection, confirm the referral occurred and that expectations for a modest, not guaranteed, benefit were set.

1. No improvement after an adequate first-line trial (a scheduled oral or topical NSAID/acetaminophen course of 1-2 weeks alongside activity modification and heat): reassess the diagnosis before simply extending or escalating the same therapy — re-confirm reproducible tenderness, re-screen for any red flag that may have been absent initially, and re-examine specifically for new swelling.
2. Symptoms persisting beyond about 1 year: refer for a targeted stretching physical therapy program, which has evidence specifically in this group.
3. Recalcitrant pain despite an adequate conservative trial over several months: refer for consideration of a physician-administered local corticosteroid/lidocaine injection, setting expectations that evidence for this option is limited.
4. New fever, warmth, erythema, or fluctuance at any point during a conservative trial: stop assuming idiopathic costochondritis and refer promptly for evaluation of infectious (septic) costochondritis, particularly in a patient who injects drugs, is immunocompromised, or has had recent thoracic surgery.
5. New or enlarging swelling, or any constitutional symptom (unexplained weight loss, night sweats): reconsider the differential (thoracic tumour, an evolving Tietze syndrome, or another structural cause) rather than continuing conservative therapy unchanged.
6. Any new red flag from the Undifferentiated Chest Pain chapter's screen appearing at any point, even in a patient with a previously confirmed costochondritis diagnosis: treat as a new, undifferentiated presentation and re-apply that chapter's screen in full — a prior benign diagnosis does not cover a genuinely new or changed pain pattern.

• Reassuring a patient as "just costochondritis" based on reproducible chest wall tenderness alone, without first applying the Undifferentiated Chest Pain chapter's red-flag screen — reproducible tenderness does not exclude a concurrent cardiac cause, especially in a patient with cardiac risk factors.^[3][1]
• Treating Tietze syndrome (swelling present) identically to costochondritis (no swelling) without recognizing the difference matters for follow-up of the swelling itself.
• Missing infectious (septic) costochondritis in a patient who injects drugs, is immunocompromised, or has had recent thoracic surgery, by attributing fever or local warmth to "just inflammation."
• Skipping an ECG in a patient over 35, or in anyone with cardiac risk factors or cardiopulmonary symptoms, before accepting the diagnosis.
• Continuing an ineffective NSAID or acetaminophen trial indefinitely rather than reassessing the diagnosis after a defined trial period.
• Treating persistent mild tenderness at 1 year as automatic evidence of treatment failure requiring escalating therapy, rather than recognizing it as a known part of the natural course for a minority of patients.
• Ordering routine imaging in every straightforward, reproducible, multifocal presentation without a red flag — imaging is typically normal in true costochondritis and adds little unless the presentation is atypical or a red flag is present.
• Reflexively repeating a full cardiac workup for a patient with a genuinely unchanged, previously investigated recurrence, rather than applying the same-pattern reasoning in the Undifferentiated Chest Pain chapter.

How to use this table: First-line therapy is oral or topical NSAID plus activity modification and heat, for a defined trial period. Non-NSAID and topical options are reasonable alternatives when an NSAID is not appropriate. The procedural option is reserved for genuinely recalcitrant cases and is not something a pharmacist initiates. Select any drug name to open its complete Pharmasist Drug Database page.

Oral NSAIDs — First-Line Analgesia

Use for a limited, defined course (e.g. 1-2 weeks) alongside activity modification and heat; reassess the diagnosis rather than extending indefinitely if not effective.

Topical Therapy — Minimizing Systemic Exposure

Reasonable first choice when the tender area is small, well-localized, and reproducible; lower systemic exposure than an oral NSAID.

Non-NSAID Analgesia

For patients in whom an NSAID is contraindicated or not tolerated; no anti-inflammatory effect.

Recalcitrant Cases — Physician-Administered Procedure

Reserve for pain that has not responded to an adequate conservative trial over several months. This is a physician-administered procedure, not a pharmacist-initiated therapy; evidence for its use in costochondritis/Tietze syndrome specifically is limited to a small observational study.