```html

Kehr’s Sign – Understanding Shoulder Pain That Signals Internal Trouble

What is Kehr's sign?

Kehr’s sign refers to pain felt in the left shoulder (or, less commonly, the right shoulder) that occurs when the abdomen is irritated by blood, pus, or other inflammatory fluid. The pain is transmitted via the phrenic nerve (C3‑C5), which also supplies sensation to the shoulder region. Because the diaphragm and the shoulder share this nerve pathway, irritation of the diaphragm can “re‑refer” pain to the shoulder tip—a phenomenon known as referred pain.

The sign is named after the German physician Heinrich Kehr, who described it in the early 1900s while studying patients with splenic rupture. Today, clinicians use Kehr’s sign as a clue that intra‑abdominal bleeding or irritation is present, prompting urgent investigation.

Common Causes

Kehr’s sign is not a disease itself; it is a symptom that can arise from a variety of intra‑abdominal or thoracic problems. The most frequent culprits include:

• Splenic rupture or laceration – trauma, aneurysm, or spontaneous rupture.
• Ectopic (tubal) pregnancy – especially when rupture leads to intraperitoneal bleeding.
• Ruptured hepatic (liver) lesions – such as an aneurysm, hemangioma, or traumatic injury.
• Perforated peptic ulcer – leakage of gastric contents irritates the diaphragm.
• Acute pancreatitis – especially when pancreatic enzymes spill into the peritoneal cavity.
• Pelvic inflammatory disease (PID) with tubo‑ovarian abscess – can cause referred shoulder pain.
• Subphrenic abscess – collection of pus beneath the diaphragm.
• Traumatic diaphragmatic injury – caused by blunt or penetrating trauma.
• Severe pericarditis or pericardial effusion – inflammation may irritate the left phrenic nerve.
• Thoracic aortic aneurysm rupture – rare, but can produce similar referred pain.

Associated Symptoms

Because Kehr’s sign is a manifestation of internal irritation, it often appears alongside other signs that reflect the underlying condition:

• Sudden, severe abdominal or flank pain
• Dizziness, light‑headedness, or syncope (suggesting blood loss)
• Nausea, vomiting, or loss of appetite
• Abdominal distension or guarding
• Fever or chills (if infection or abscess is present)
• Rapid heart rate (tachycardia) and low blood pressure (hypotension)
• Shortness of breath, especially if the diaphragm is limited by blood or fluid
• Menstrual irregularities or missed period (in the case of ectopic pregnancy)

When to See a Doctor

Kehr’s sign should never be ignored, especially when it appears abruptly or with any of the associated symptoms above. Seek medical attention promptly if you notice:

• Sudden shoulder pain following a blow to the abdomen or chest.
• Shoulder pain that worsens with deep breathing, coughing, or movement.
• Any signs of internal bleeding: faintness, paleness, rapid breathing, or a “racing” heart.
• Persistent abdominal pain that does not improve with over‑the‑counter pain relievers.
• Fever ≥ 100.4 °F (38 °C) with shoulder pain.
• Vaginal bleeding or a missed period in a woman of child‑bearing age.
• Difficulty swallowing, severe shortness of breath, or chest pain.

When in doubt, call emergency services (e.g., 911 in the U.S.) or go to the nearest emergency department.

Diagnosis

Evaluating Kehr’s sign involves a systematic approach to identify the source of diaphragmatic irritation.

1. History and Physical Examination

• Detailed trauma history (falls, motor‑vehicle accidents, sports injuries).
• Gynecologic history in women (last menstrual period, contraception, pregnancy risk).
• Review of gastrointestinal symptoms (vomiting, melena, change in bowel habits).
• Focused abdominal exam: guarding, rebound tenderness, distension.
• Shoulder exam: palpation of the acromioclavicular region, range of motion, reproduction of pain with deep inspiration.

2. Laboratory Tests

• Complete blood count (CBC) – looks for anemia (blood loss) or leukocytosis (infection).
• Serum amylase/lipase – elevated in pancreatitis.
• Liver function tests – for hepatic injury.
• Pregnancy test (β‑hCG) – essential in any woman of reproductive age.
• Type and cross‑match – in anticipation of possible blood transfusion.

3. Imaging Studies

• Focused Assessment with Sonography for Trauma (FAST) – rapid bedside ultrasound to detect free fluid.
• Computed Tomography (CT) scan of the abdomen/pelvis with contrast – gold standard for locating bleeding, organ injury, or abscess.
• Chest X‑ray – evaluates diaphragmatic elevation, pneumothorax, or mediastinal widening.
• Magnetic Resonance Imaging (MRI) – occasional use for detailed soft‑tissue assessment.
• Diagnostic laparoscopy – may be required when imaging is inconclusive but suspicion remains high.

Treatment Options

Treatment is directed at the underlying cause; the shoulder pain generally resolves once the source of irritation is addressed.

1. Emergency Management

• Resuscitation – airway, breathing, circulation; large‑bore IV access; isotonic fluids or blood products as needed.
• Analgesia – IV opioids (e.g., morphine) or ketamine for severe pain, keeping in mind hemodynamic status.
• Stabilization of fractures – if trauma involves rib or clavicle breaks.

**Condition‑Specific Therapies**

• Splenic rupture – operative splenectomy or splenic artery embolization.
• Ectopic pregnancy – methotrexate (medical) or salpingectomy (surgical) depending on stability.
• Perforated ulcer – emergent surgical repair and proton‑pump inhibitor (PPI) therapy.
• Acute pancreatitis – aggressive IV hydration, bowel rest, analgesics, and monitoring for complications.
• Subphrenic abscess – percutaneous drainage plus broad‑spectrum antibiotics.
• Pericardial effusion – pericardiocentesis if tamponade is present.

2. Home Care & Symptom Relief (after stabilization)

• Ice pack or warm compress on the shoulder (based on comfort).
• Over‑the‑counter acetaminophen or ibuprofen, provided there are no contraindications.
• Gentle shoulder stretches after physician clearance to prevent stiffness.
• Adequate rest and avoidance of heavy lifting for several weeks.
• Follow‑up appointments for imaging or labs as ordered.

Prevention Tips

While many causes of Kehr’s sign (e.g., trauma) are unpredictable, several preventive measures can lower risk:

• Wear seat belts and use appropriate protective gear during high‑impact sports.
• Practice safe sex and use contraception to reduce the chance of ectopic pregnancy.
• Manage chronic conditions such as peptic ulcer disease with PPIs or H2 blockers and avoid NSAIDs when possible.
• Limit alcohol intake and maintain a healthy weight to lower the risk of pancreatitis.
• Seek prompt medical care for abdominal infections or unexplained pain to prevent abscess formation.
• Stay up to date on vaccinations (e.g., hepatitis B) that can protect liver health.
• Regular prenatal care – early detection of abnormal pregnancies can avert rupture.

Emergency Warning Signs

References

• Mayo Clinic. “Splenic rupture.” https://www.mayoclinic.org.
• Cleveland Clinic. “Ectopic Pregnancy.” https://my.clevelandclinic.org.
• American College of Surgeons. “FAST exam.” https://www.facs.org.
• NIH National Institute of Diabetes and Digestive and Kidney Diseases. “Acute Pancreatitis.” https://www.niddk.nih.gov.
• World Health Organization. “Maternal health.” https://www.who.int.
• CDC. “Sexually transmitted infections (STIs).” https://www.cdc.gov.

```