Urgent Care · Common Complaints
Abdominal Pain
Abdominal pain in the urgent care setting: the job is to separate surgical from medical, and to identify the small set of catastrophes that look like benign pain at first. This page covers can't-miss diagnoses (obstruction, perforation, mesenteric ischemia, appendicitis, cholecystitis, pancreatitis, AAA, diverticulitis, sepsis, medication-induced ileus, C. difficile), red flags, immediate management, condition-specific pathways, the minimum safe first-pass workup, what can be managed outpatient only after serious causes are excluded, escalation criteria, defensive documentation, and safety-net return precautions. Written for NPs, PAs, and MDs caring for all adults — with a geriatric-modifier section at the bottom for adults 55+, geriatrics 65+, and frail younger adults in urgent care and LTC.
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Urgent Care · Common Complaints
Abdominal Pain
Why this symptom matters
The job is to separate surgical from medical, and to identify the small set of catastrophes that look like benign pain at first.
Vital signs, serial exams, and a low threshold for imaging are your highest-yield tools — a benign-feeling abdomen at first look does not rule out surgical pathology, and pain out of proportion to exam should always prompt escalation.
What must I not miss first?
- Bowel obstruction
- Perforation
- Mesenteric ischemia
- Appendicitis (often atypical in older adults)
- Cholecystitis (often afebrile)
- Pancreatitis
- AAA rupture or expansion
- Diverticulitis (with abscess or perforation)
- Sepsis from intra-abdominal source
- Medication-induced ileus (opioids, anticholinergics, GLP-1 agonists)
- C. difficile colitis
- Ectopic pregnancy / ovarian or testicular torsion
Red flags — escalate or work up urgently
- Severe pain out of proportion to exam (mesenteric ischemia)
- Persistent vomiting or inability to tolerate PO
- Inability to pass gas or stool; abdominal distension
- Peritoneal signs (rigidity, rebound, guarding)
- Fever + tachycardia, or hypotension
- GI bleeding (hematemesis, melena, hematochezia)
- New confusion (geriatric sepsis equivalent)
- Recent antibiotic use (C. diff risk)
- History of vascular disease or AFib (ischemia risk)
- Pulsatile abdominal mass + back pain (AAA)
- Pregnancy (or possible pregnancy) with abdominal pain or bleeding
- Anticoagulated patient with abdominal pain or bruising
Immediate Management — While You Work It Up
- Vitals + SpO₂ + blood glucose immediately. Assess hydration status.
- Focused abdominal exam — peritoneal signs, distension, hernia, masses, CVA tenderness; rectal if GI bleed/obstruction concern.
- Assess for obstruction — distension, high-pitched or absent bowel sounds.
- Medication review — opioids, anticholinergics, GLP-1 agonists, recent antibiotics.
- NPO immediately if surgical abdomen or obstruction is possible.
- IV access and monitoring for severe pain, instability, or vomiting.
- IV fluids — NS or LR if hemodynamically unstable, dehydrated, or NPO.
- Ondansetron 4 mg IV / IM / ODT for nausea and vomiting (safe before diagnosis is established).
- Avoid NSAIDs — renal and GI risk in older adults.
- Avoid opioids unless severe pain — document reasoning if used; can mask exam findings.
- Upright abdominal X-ray if obstruction or free air is suspected.
- Do not send a hemodynamically unstable abdominal pain patient home — call 911 if vitals are concerning at any point.
Minimum safe first-pass workup
- What to ask: location/migration, onset, character, radiation, vomiting, last BM/flatus, GU symptoms, LMP, sexual activity, alcohol use, recent antibiotics, baseline function
- What to examine: vitals, full abdominal exam (peritoneal signs, hernia, masses, CVA tenderness), GU exam if indicated, rectal if GI bleed/obstruction concern
- Urine pregnancy test in any reproductive-age person
- UA, CBC, BMP, lipase
- POC glucose if AMS or diabetic
- Abdominal X-ray if obstruction suspected
- RUQ ultrasound if biliary suspected
- CT typically requires ED — escalate when disposition-changing imaging is needed
- Stool studies (including C. diff) if recent antibiotics + diarrhea
What can usually be managed outpatient
Only after surgical/vascular/infectious causes have been thoughtfully ruled out:
- Mild diverticulitis (stable, no red flags, tolerating PO)
- Mild gastritis or known GERD/dyspepsia, normal vitals
- Constipation with classic history and benign exam (no obstruction)
- Recurrent known IBS-pattern pain with reassuring exam
- Viral gastroenteritis in well-appearing patient tolerating PO (rare and risky in geriatrics)
When to escalate to ED / higher level of care
Condition-specific pathways:
- Suspected bowel obstruction: NPO, avoid oral laxatives, abdominal X-ray, ED for CT and surgical evaluation.
- Suspected cholecystitis: RUQ pain, nausea, anorexia (often afebrile in geriatrics) → ultrasound; ED if unstable.
- Suspected pancreatitis: epigastric pain radiating to back, nausea/vomiting → check lipase; ED if severe.
- Suspected diverticulitis: LLQ pain, low-grade fever → empiric antibiotics if stable; ED if peritoneal signs.
- Suspected mesenteric ischemia: pain out of proportion, AFib, vascular disease → ED immediately.
- Suspected C. difficile: watery diarrhea, recent antibiotics, abdominal pain → test stool; ED if severe dehydration or hypotension.
- Suspected AAA: pulsatile mass + back pain → ED immediately.
Escalate to ED for:
- Any red flag
- Severe pain you can't explain
- Peritoneal signs, distension, or persistent vomiting
- GI bleeding, hypotension, or fever + tachycardia
- Older adult with new abdominal pain — atypical presentations are common
- Suspected obstruction, ischemia, perforation, or AAA
- Inability to tolerate oral fluids or signs of dehydration not corrected in clinic
- No improvement with initial treatment
What to document when the diagnosis is still uncertain
- Specific location, onset, character, modifiers, associated symptoms
- Vitals + SpO₂; abdominal exam findings (bowel sounds, distension, peritoneal signs)
- Medication review (opioids, anticholinergics, GLP-1, recent antibiotics)
- Pregnancy test result (or why not done)
- Labs and imaging findings
- "Surgical abdomen / obstruction / ischemia / perforation / AAA / ectopic considered because… ruled out today because…"
- Why ED transfer is or is not indicated
- Tolerance of PO before discharge, discharge vitals, return precautions
- Who was notified (PCP, surgery, family)
Safety-net & return precautions to give
- Return or call 911 for worsening pain, fever, vomiting blood, blood in stool, fainting, severe weakness, new confusion, dizziness, or inability to keep liquids down.
- Return for inability to pass gas or stool.
- Return today for any new pregnancy concern (vaginal bleeding, severe one-sided pain).
- Return if no improvement in 24 hours.
- Follow up with PCP in 24–48 hours if pain persists.
Geriatric-specific modifiers (apply on top of the above)
The guidance above applies to all adult patients seen in this setting. Layer the points below for adults 55+, geriatric (65+), and frail younger adults — they are additions, not replacements.
Abdominal pain in older adults is high-risk because classic symptoms are often absent or muted. Geriatric patients may have no fever, no leukocytosis, minimal tenderness, atypical presentations, and rapid deterioration.
Up to 50% of older adults with a surgical abdomen present without classic pain. A soft belly does not rule out a surgical abdomen in this population.
- Lower the threshold for CT imaging — exam is unreliable, and ischemia / obstruction / perforation can present quietly.
- Consider mesenteric ischemia in any older adult with pain out of proportion to exam, atrial fibrillation, or known vascular disease.
- Cholecystitis in older adults is often afebrile and may present as confusion, anorexia, or weakness.
- Constipation, opioid-induced ileus, and urinary retention are common mimics — examine the bladder and review meds.
- Avoid empiric NSAIDs; consider AKI, GI bleed, and PUD risk.
Educational guidance for clinicians. Not a substitute for clinical judgment. Always individualize to the patient and your local resources.
Evidence sources
- · ACEP Clinical Policies
- · AAFP Abdominal Pain references
- · AGS Geriatric ED Guidelines
- · ACS Surgical Guidelines
Review status
Last reviewed: 2026-04
Reviewed by the MyClinicianGuide editorial team. Cadence: annual.
Educational reference for licensed clinicians (NP, PA, MD, DO). Not a substitute for clinical judgment, institutional protocols, or specialty consultation. Apply in context of the full clinical picture, patient goals, and current standards of care. See About AI guidance for AI-related limitations.
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