appendicitis sym
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appendicitis diagnosis clinical features
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Here is a thorough breakdown of appendicitis symptoms and signs, drawn from Current Surgical Therapy 14e, Tintinalli's Emergency Medicine, and Rosen's Emergency Medicine.
Appendicitis - Symptoms & Signs
Pathophysiology (Why Symptoms Occur)
Obstruction of the appendiceal lumen (most often by a fecalith/appendicolith, or lymphoid hyperplasia) causes bacterial overgrowth, distension, and venous congestion. Stretching of visceral afferent nerve fibers produces the initial vague periumbilical pain. As inflammation progresses to the parietal peritoneum, pain localizes to the right lower quadrant (RLQ).
Classic Symptom Sequence
| Stage | Symptom |
|---|---|
| Early (hours 1-4) | Vague, crampy periumbilical or epigastric pain; anorexia; malaise |
| Middle | Nausea, vomiting (typically after pain onset - if vomiting precedes pain, think other diagnosis) |
| Late (hours 6-12+) | Pain migrates to RLQ (McBurney's point) and becomes constant |
Symptoms (History)
- Pain migration: periumbilical/epigastric pain shifting to RLQ - a hallmark feature (scores 1 point in Alvarado scoring)
- Anorexia: very common; often the first symptom after pain (scores 1 point)
- Nausea and/or vomiting: typically follow pain onset (scores 1 point)
- General malaise
- Low-grade fever (>38.0°C)
Physical Examination Signs
| Sign | Description | Sensitivity | Specificity |
|---|---|---|---|
| RLQ tenderness at McBurney's point | 1/3 distance from right ASIS to umbilicus | High | High |
| Voluntary/involuntary guarding | Abdominal muscle rigidity | - | - |
| Rebound tenderness | Pain on release of deep palpation | Moderate | Moderate |
| Rovsing's sign | LLQ palpation causes RLQ pain | 30-68% | 58-91% |
| Psoas sign | Right hip extension causes pain (retrocecal appendix) | 16-39% | 50-95% |
| Obturator sign | Internal rotation of right hip causes pain (pelvic appendix) | 21-34% | 79-96% |
| Tachycardia | From pain/fever/early sepsis | - | - |
| Percussion tenderness | Consistent with peritoneal irritation | - | - |
Note: The classic signs (Rovsing's, psoas, obturator) are specific but not sensitive - absence does not rule out appendicitis.
Modified Alvarado Score (MANTRELS)
| Feature | Points |
|---|---|
| Migration of pain to RLQ | 1 |
| Anorexia or elevated urinary acetone | 1 |
| Nausea/vomiting | 1 |
| RLQ tenderness | 2 |
| Rebound tenderness | 1 |
| Fever (>37.3°C oral / >37.7°C rectal) | 1 |
| WBC > 10,000/mm³ | 2 |
| Total | 9 |
- Score 1-4: Low probability
- Score 5-9: Possible to probable appendicitis
Laboratory Findings
- Leukocytosis (WBC >10,000/mm³) with left shift (>75% neutrophilia)
- Elevated CRP (>10 mg/L increases concern; <8 mg/L with normal WBC helps exclude appendicitis)
- Urinalysis: sterile pyuria may occur due to proximity of inflamed appendix to the bladder - do not automatically attribute to UTI
- Negative urine pregnancy test required in females of reproductive age
Imaging
| Modality | Sensitivity | Specificity | Notes |
|---|---|---|---|
| CT abdomen/pelvis | 94% | 90% | Preferred in adults; shows dilated fluid-filled appendix, periappendiceal fat stranding, appendicoliths |
| Ultrasound | 78% | 83% | Preferred in children and pregnancy; non-compressible appendix >6 mm on U/S |
| MRI | Similar to CT | - | Preferred in pregnancy when US inconclusive |
Atypical Presentations
- Retrocecal appendix (most common variant): RLQ pain may be absent; psoas sign dominates
- Pelvic appendix: obturator sign prominent; may mimic pelvic pathology
- Pregnancy: pain may be in the right upper quadrant (especially second half of pregnancy); peritoneal signs less reliable; physiologic leukocytosis confounds WBC
- Children <6 years: frequently present with perforation already established; atypical findings common
- Elderly/immunocompromised: symptoms may be blunted; higher perforation rate at presentation
Sources: Current Surgical Therapy 14e, p. 324 | Tintinalli's Emergency Medicine | Rosen's Emergency Medicine
right iliac quadrant pain
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Here is a structured clinical approach to right iliac fossa (RIF) / right lower quadrant (RLQ) pain, drawing from Tintinalli's Emergency Medicine, Rosen's Emergency Medicine, Sabiston Textbook of Surgery, and Yamada's Textbook of Gastroenterology.
Right Iliac Fossa / RLQ Pain - Differential Diagnosis
The key initial step is stratifying by sex and age, as this narrows the differential considerably.
Differential by Category
Gastrointestinal (All patients)
| Condition | Key Distinguishing Features |
|---|---|
| Appendicitis | Periumbilical pain migrating to RLQ, anorexia, fever, nausea/vomiting, McBurney's tenderness |
| Meckel's diverticulitis | Clinically indistinguishable from appendicitis; located ~2 ft from ileocecal valve |
| Cecal/terminal ileitis | Diarrhea, systemic symptoms; may be Crohn's or infectious (Yersinia, Campylobacter) |
| Crohn's disease | Chronic/recurrent RLQ pain, diarrhea, weight loss, perianal disease |
| Cecal volvulus | Acute severe distension, obstruction, more common in elderly |
| Epiploic appendagitis | Acute localized pain, no fever, no leukocytosis; self-limiting fat necrosis |
| Bowel obstruction / ileus | Colicky pain, distension, vomiting, absent bowel sounds |
| Incarcerated inguinal hernia | Palpable groin mass, obstructive symptoms |
| Intussusception | Children: colicky pain, "currant jelly" stools, palpable mass |
| Mesenteric lymphadenitis | Children/young adults; preceding URTI, tender without guarding; self-limiting |
| Intra-abdominal abscess | Fever, swinging pyrexia, localized tenderness, prior surgery or IBD |
Genitourinary (All patients)
| Condition | Key Distinguishing Features |
|---|---|
| Renal/ureteral colic | Colicky flank-to-groin radiation, hematuria, N&V; no peritoneal signs |
| Pyelonephritis | Fever, CVA tenderness, pyuria, dysuria |
| Testicular torsion (males) | Scrotal pain, high-riding testis, absent cremasteric reflex - emergency |
Gynecological (Females)
| Condition | Key Distinguishing Features |
|---|---|
| Ectopic pregnancy | Amenorrhea, +hCG, vaginal spotting, hemodynamic instability if ruptured - must exclude first |
| Ovarian torsion | Sudden severe pain, N&V, adnexal mass; US shows absent Doppler flow |
| Ovarian cyst (ruptured/hemorrhagic) | Sudden pain mid-cycle; US shows free fluid |
| Pelvic inflammatory disease (PID) | Cervical motion tenderness, adnexal tenderness, vaginal discharge, fever |
| Tubo-ovarian abscess | High fever, severe pelvic pain, adnexal mass, leukocytosis |
| Ovarian vein thrombosis | Postpartum or post-surgical; fever, RLQ mass |
| Mittelschmerz | Mid-cycle, self-limiting, no fever |
Musculoskeletal
| Condition | Key Distinguishing Features |
|---|---|
| Psoas abscess | Fever, hip flexion contracture, flank/RLQ tenderness; TB or Crohn's association |
| Rectus sheath hematoma | Anticoagulation use, trauma, tender abdominal wall mass; Carnett's sign positive |
| Hip pathology | Pain with movement, groin radiation, referred from joint |
Pediatric-specific
| Condition | Notes |
|---|---|
| Mesenteric lymphadenitis | Most common mimic of appendicitis in children |
| Henoch-Schonlein Purpura | Purpuric rash, arthritis, abdominal pain, hematuria |
| Intussusception | Peak age 6 months - 2 years |
Diagnostic Approach
First priority - always check:
- Urine pregnancy test in all females of childbearing age (rule out ectopic)
- Urinalysis - hematuria suggests renal colic; pyuria suggests UTI/pyelonephritis (note: sterile pyuria can occur in appendicitis)
- CBC - leukocytosis supports surgical/inflammatory cause
- CRP - elevated in most surgical emergencies
Imaging:
- CT abdomen/pelvis (with contrast): first-line in adults; sensitivity 94%, specificity 90% for appendicitis; also identifies alternative diagnoses
- Ultrasound: preferred in females (gynecological pathology), children, and pregnancy; less reliable for appendix visualization in obese patients
- MRI: preferred in pregnancy when US inconclusive (avoids radiation)
Red Flags Requiring Urgent Assessment
- Peritoneal signs (guarding, rigidity, rebound) - surgical emergency
- Hemodynamic instability (ruptured ectopic, AAA, volvulus)
- Absent bowel sounds + distension (obstruction, volvulus)
- Positive pregnancy test + pain (ectopic until proven otherwise)
- Absent cremasteric reflex in males (testicular torsion)
Sources: Tintinalli's Emergency Medicine, Table 81-1 | Rosen's Emergency Medicine, Table 79.3 | Sabiston Textbook of Surgery | Yamada's Textbook of Gastroenterology, Right Lower Quadrant section
uti sym
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Here is a complete breakdown of UTI symptoms, organized by type and patient group, drawn from Rosen's Emergency Medicine, Tintinalli's Emergency Medicine, Campbell-Walsh-Wein Urology, and Symptom to Diagnosis (4th ed.).
UTI - Symptoms & Signs
UTIs are classified as lower (cystitis, urethritis) or upper (pyelonephritis). The distinction is primarily clinical and changes management significantly.
Lower UTI (Cystitis)
These are symptoms of bladder/urethral involvement:
| Symptom | Description |
|---|---|
| Dysuria | Burning or pain during urination ("internal dysuria" - felt inside the urethra/bladder) |
| Urinary frequency | Needing to void more often than usual, often small volumes |
| Urinary urgency | Sudden, compelling urge to void |
| Nocturia | Waking at night to urinate |
| Suprapubic pain/pressure | Aching or fullness over the lower abdomen |
| Hematuria | Blood in urine - present in ~50% of cystitis cases |
| Cloudy or foul-smelling urine | From pyuria and bacteriuria |
| Low-grade or no fever | Systemic symptoms are typically absent in uncomplicated cystitis |
Clinical pearl: If a woman has dysuria + frequency without vaginal discharge or irritation, the probability of cystitis is >90%. - Symptom to Diagnosis, 4th ed.
Upper UTI (Pyelonephritis)
Pyelonephritis = infection of renal parenchyma + pelvicalyceal system. Symptoms of cystitis may or may not be present alongside:
| Symptom | Description |
|---|---|
| Fever | Often high-grade (>38.5°C); rigors/chills |
| Flank pain | Unilateral or bilateral; dull or sharp aching in the loin |
| Costovertebral angle (CVA) tenderness | Pain on percussion or deep palpation over the kidney angle - hallmark finding |
| Nausea and vomiting | Common with upper tract involvement |
| Malaise and prostration | General systemic unwellness |
| Back pain | May be the dominant complaint |
Mild pyelonephritis: low-grade fever + flank/CVA pain Severe pyelonephritis: high fever, rigors, nausea/vomiting, frank flank pain
Sex-Specific Differences
In Women
- UTI is far more common due to a shorter urethra
- Vaginal discharge decreases the probability of UTI (favors vaginitis or STI instead)
- External dysuria (burning at the perineum/labia) suggests vaginitis or herpes, not cystitis
In Men
- UTI is considered complicated by default and warrants workup for underlying cause
- Symptoms: urgency, frequency, dysuria, hematuria, suprapubic pain
- If fever + irritative symptoms + difficulty voiding: suspect acute bacterial prostatitis (perform digital rectal exam)
In Elderly / Debilitated Patients
- Classic symptoms may be absent entirely
- May present atypically with: altered mental status, lethargy, abdominal pain, falls, or generalized weakness
- Fever may be absent even with pyelonephritis
Differential Diagnosis of Dysuria
| Cause | Key Features |
|---|---|
| UTI (cystitis) | Internal dysuria, abrupt onset, frequency/urgency, suprapubic pain, pyuria/hematuria |
| STI (chlamydia, gonorrhea) | Gradual onset, new/multiple sexual partners, vaginal/urethral discharge |
| Vaginitis | External dysuria, vaginal discharge, odor, pruritus |
| Urethritis | Urethral discharge, STI risk factors |
| Interstitial cystitis | Chronic pelvic pain, frequency, no infection |
| Renal/ureteral calculus | Colicky flank-to-groin pain, hematuria, no pyuria |
Diagnostic Tests
| Test | Finding | Significance |
|---|---|---|
| Leukocyte esterase | Positive | Pyuria (WBCs); LR+ 12.3-48 |
| Nitrites | Positive | Gram-negative bacteriuria; LR+ 3-30 |
| WBC on microscopy | >5/HPF | Pyuria |
| RBCs / blood on dipstick | Positive | Hematuria (~50% of cystitis) |
| Urine culture | ≥10⁵ CFU/mL | Confirms UTI and guides antibiotic choice |
A negative leukocyte esterase and nitrite does not rule out cystitis in the presence of a convincing clinical picture (combined LR- only 0.3).
When No Testing Is Needed
Women with classic uncomplicated cystitis (dysuria ± frequency, no vaginal discharge) may be treated empirically without urinalysis or culture per evidence-based guidelines. - Symptom to Diagnosis, 4th ed.
Sources: Rosen's Emergency Medicine | Tintinalli's Emergency Medicine, Chapters 85 & 91 | Campbell-Walsh-Wein Urology | Symptom to Diagnosis, 4th ed., Chapter 16
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