Differential Diagnosis Guide Based On Chief Complaints For Surgery

Surgery: Differential Diagnosis Guide Based On Chief Complaints
Abdominal Pain
Key Questions
  • Where is the pain located?
  • What type of pain is it – sharp, dull, crampy?
  • Is there vomiting or fever?
  • Any relation with food or movement?
Red Flags
  • Sudden onset pain
  • Pain shifting from central to right lower abdomen
  • Back-radiating pain
Differential Diagnoses
  • Appendicitis
  • Cholecystitis
  • Pancreatitis
  • Intestinal Obstruction
  • Perforated Ulcer
  • Renal Colic
Probable Diagnosis Clues
  • RLQ pain with rebound tenderness → Appendicitis
  • RUQ pain after fatty meals → Cholecystitis
  • Epigastric pain radiating to back → Pancreatitis
Chest Pain
Key Questions
  • Is the pain tight, burning, or stabbing?
  • Does it radiate to arm, jaw, or back?
  • Does it occur with exertion or at rest?
Red Flags
  • Crushing chest pain
  • Shortness of breath
  • Severe sweating or nausea
Differential Diagnoses
  • Myocardial Infarction
  • GERD
  • Pneumothorax
  • Aortic Dissection
  • Pulmonary Embolism
Probable Diagnosis Clues
  • Radiating chest pain with sweating → Myocardial Infarction
  • Burning pain after meals → GERD
  • Sudden sharp chest pain + SOB → Pneumothorax
Vomiting
Key Questions
  • What is the content – food, bile, blood?
  • Is it related to meals?
  • Any associated abdominal pain or headache?
Red Flags
  • Projectile vomiting in infants
  • Bilious vomiting
  • No passage of flatus or stool
Differential Diagnoses
  • Gastroenteritis
  • Intestinal Obstruction
  • Pyloric Stenosis (infants)
  • Increased Intracranial Pressure
  • Pancreatitis
Probable Diagnosis Clues
  • Projectile vomiting in infant (3–6 weeks) → Pyloric Stenosis
  • Bilious vomiting + no flatus → Intestinal Obstruction
  • Vomiting + headache → Raised Intracranial Pressure
Swelling / Lump
Key Questions
  • Location and duration of swelling?
  • Is it painful?
  • Associated systemic symptoms (fever, weight loss)?
Red Flags
  • Rapid increase in size
  • Ulceration or discharge
  • Fixity to skin or underlying structure
Differential Diagnoses
  • Lipoma
  • Epidermoid cyst
  • Abscess
  • Lymphadenopathy
  • Tumor (benign/malignant)
Probable Diagnosis Clues
  • Soft, mobile, painless → Lipoma
  • Fluctuant, tender, red → Abscess
  • Firm, fixed, growing → Neoplasm
Non-Healing Ulcer
Key Questions
  • Duration and site of ulcer?
  • Any discharge or bleeding?
  • Previous trauma or injury?
Red Flags
  • Ulcer lasting >3 weeks
  • Raised edges
  • Induration around ulcer
Differential Diagnoses
  • Chronic traumatic ulcer
  • Tubercular ulcer
  • Carcinoma
  • Venous ulcer
Probable Diagnosis Clues
  • Punched out, painless, base pale → TB ulcer
  • Raised everted edges, bleeding → Carcinoma
  • Ulcer over medial malleolus → Venous ulcer
Fever
Key Questions
  • Duration and pattern of fever?
  • Associated chills or rigors?
  • Presence of cough, sore throat, or abdominal pain?
Red Flags
  • High fever > 103°F
  • Prolonged fever for more than 7 days
  • Signs of sepsis (hypotension, tachycardia)
Differential Diagnoses
  • Infection (pneumonia, UTI, malaria)
  • Inflammatory diseases (autoimmune conditions)
  • Endocrine (hyperthyroidism)
  • Malignancy (lymphoma, leukemia)
Probable Diagnosis Clues
  • Intermittent fever with chills → Malaria
  • Fever + focal infection → Pneumonia/UTI
  • Unexplained prolonged fever → Lymphoma
Jaundice
Key Questions
  • Onset and progression of jaundice?
  • Associated pain in the abdomen or itching?
  • Recent travel history or history of alcohol intake?
Red Flags
  • Dark urine and pale stools
  • Significant weight loss
  • Hepatomegaly or ascites
Differential Diagnoses
  • Hepatitis (viral, alcohol-induced)
  • Gallstones
  • Liver cirrhosis
  • Pancreatic cancer
Probable Diagnosis Clues
  • Elevated AST, ALT → Hepatitis
  • Obstructive jaundice with RUQ pain → Gallstones
  • Severe weight loss + jaundice → Pancreatic cancer
Dysphagia
Key Questions
  • Which type of food causes difficulty swallowing?
  • Any pain or regurgitation of food?
  • Any weight loss or history of cancer?
Red Flags
  • Difficulty swallowing liquids
  • Unexplained weight loss
  • Persistent cough or choking during meals
Differential Diagnoses
  • Esophageal stricture
  • Achalasia
  • Esophageal cancer
  • Gastroesophageal reflux disease (GERD)
Probable Diagnosis Clues
  • Difficulty with both solids and liquids → Achalasia
  • Difficulty swallowing solids → Esophageal stricture
  • Regurgitation of food + weight loss → Esophageal cancer
Hematemesis
Key Questions
  • Amount and appearance of blood?
  • Any associated abdominal pain or history of ulcers?
  • Recent history of alcohol intake or NSAIDs?
Red Flags
  • Large amounts of blood
  • Shock symptoms (hypotension, tachycardia)
  • Ongoing bleeding despite treatment
Differential Diagnoses
  • Peptic ulcer disease
  • Esophageal varices
  • Gastric cancer
  • Gastritis
Probable Diagnosis Clues
  • History of alcohol use → Esophageal varices
  • Burning epigastric pain + black stools → Peptic ulcer
  • Unexplained weight loss + mass on endoscopy → Gastric cancer
Shortness of Breath
Key Questions
  • Is it sudden or gradual onset?
  • Any history of asthma or heart disease?
  • Is it associated with chest pain or wheezing?
Red Flags
  • Severe difficulty breathing
  • Chest pain or hemoptysis
  • Orthopnea or paroxysmal nocturnal dyspnea
Differential Diagnoses
  • Asthma
  • Congestive heart failure
  • Pulmonary embolism
  • Pneumonia
Probable Diagnosis Clues
  • Wheezing + history of allergies → Asthma
  • Orthopnea + bilateral crackles → CHF
  • Sudden onset SOB + pleuritic pain → Pulmonary embolism
Weight Loss
Key Questions
  • How much weight have you lost?
  • Has appetite changed?
  • Any fever or night sweats?
Red Flags
  • Unintentional weight loss >10% of body weight
  • Associated fatigue or weakness
  • History of cancer or unexplained symptoms
Differential Diagnoses
  • Malignancy (cancer)
  • Hyperthyroidism
  • Malabsorption (celiac, Crohn’s disease)
  • Diabetes mellitus
Probable Diagnosis Clues
  • Unexplained weight loss + cachexia → Cancer
  • Increased appetite + sweating → Hyperthyroidism
  • Weight loss + diarrhea → Malabsorption
Abdominal Pain
Key Questions
  • Where is the pain located?
  • Is it sharp, dull, or crampy?
  • Any nausea, vomiting, or diarrhea?
Red Flags
  • Severe, sudden-onset pain
  • Fever and vomiting
  • Peritonitis signs (rigid abdomen)
Differential Diagnoses
  • Appendicitis
  • Cholecystitis
  • Peptic ulcer disease
  • Intestinal obstruction
Probable Diagnosis Clues
  • Right lower quadrant pain, fever → Appendicitis
  • RUQ pain, nausea, jaundice → Cholecystitis
  • Burning epigastric pain, relieved by food → Peptic ulcer disease
  • Vomiting, distention, no bowel movement → Obstruction
Hematuria
Key Questions
  • Is it microscopic or gross hematuria?
  • Any associated pain or burning sensation?
  • History of trauma, UTI, or kidney stones?
Red Flags
  • Persistent hematuria despite treatment
  • Presence of clot or significant blood loss
  • Flank pain or fever
Differential Diagnoses
  • Urinary tract infection (UTI)
  • Kidney stones
  • Bladder cancer
  • Glomerulonephritis
Probable Diagnosis Clues
  • Cloudy urine, dysuria → UTI
  • Flank pain + hematuria → Kidney stones
  • Visible blood in urine, no pain → Bladder cancer
  • Blood + protein in urine → Glomerulonephritis
Cough
Key Questions
  • Is the cough dry or productive?
  • Any history of smoking or exposure to dust?
  • Any fever, weight loss, or night sweats?
Red Flags
  • Persistent cough >3 weeks
  • Cough with hemoptysis
  • Difficulty breathing or chest pain
Differential Diagnoses
  • Acute viral respiratory infection
  • Chronic obstructive pulmonary disease (COPD)
  • Asthma
  • Lung cancer
Probable Diagnosis Clues
  • Productive cough, smoker → COPD
  • Dry cough with wheezing → Asthma
  • Persistent cough with weight loss → Lung cancer
Vomiting
Key Questions
  • When does the vomiting occur (after eating, in the morning)?
  • Is there any blood or bile in the vomit?
  • Any associated abdominal pain, dizziness, or fever?
Red Flags
  • Projectile vomiting
  • Blood in vomit (hematemesis)
  • Signs of dehydration or electrolyte imbalance
Differential Diagnoses
  • Gastroenteritis
  • Peptic ulcer disease
  • Gastric outlet obstruction
  • CNS causes (intracranial pressure increase)
Probable Diagnosis Clues
  • Diarrhea + vomiting → Gastroenteritis
  • Epigastric pain + vomiting → Peptic ulcer disease
  • Persistent vomiting with distension → Obstruction
Hemoptysis
Key Questions
  • Amount and appearance of blood (bright red, frothy)?
  • Any associated chest pain, cough, or fever?
  • History of smoking, TB, or lung disease?
Red Flags
  • Massive or ongoing hemoptysis
  • Associated dyspnea, cyanosis, or shock
  • Unexplained weight loss
Differential Diagnoses
  • Chronic obstructive pulmonary disease (COPD)
  • Lung cancer
  • Tuberculosis (TB)
  • Pulmonary embolism
Probable Diagnosis Clues
  • History of smoking → Lung cancer/COPD
  • Night sweats + blood streaked sputum → TB
  • Sudden onset, pleuritic pain → Pulmonary embolism
Dysuria
Key Questions
  • Is the pain constant or with urination?
  • Any associated fever, flank pain, or discharge?
  • History of sexual activity or catheter use?
Red Flags
  • Severe pain, fever
  • Flank pain or blood in urine
  • Recurrent UTIs
Differential Diagnoses
  • Urinary tract infection (UTI)
  • Urethritis
  • Interstitial cystitis
  • Prostatitis (in males)
Probable Diagnosis Clues
  • Frequent urination + burning → UTI
  • Painful urination + discharge → Urethritis
  • Pelvic pressure + painful urination → Interstitial cystitis
Shock
Key Questions
  • Is the patient conscious or unconscious?
  • Any history of trauma, bleeding, or infection?
  • Is there hypotension, tachycardia, or oliguria?
Red Flags
  • Severe hypotension
  • Decreased urine output
  • Confusion or altered mental status
Differential Diagnoses
  • Hypovolemic shock (blood loss, dehydration)
  • Cardiogenic shock (MI, heart failure)
  • Septic shock (infection)
  • Neurogenic shock (spinal cord injury)
Probable Diagnosis Clues
  • Blood loss → Hypovolemic shock
  • Chest pain + hypotension → Cardiogenic shock
  • Fever + hypotension → Septic shock
Chest Pain
Key Questions
  • Is the pain sharp, dull, or burning?
  • Any radiation to the arm, jaw, or back?
  • Associated with exertion or rest?
  • Any history of heart disease or trauma?
Red Flags
  • Sudden onset of severe pain
  • Shortness of breath or dizziness
  • History of myocardial infarction
Differential Diagnoses
  • Acute myocardial infarction
  • Angina pectoris
  • Pneumothorax
  • Gastroesophageal reflux disease (GERD)
Probable Diagnosis Clues
  • Chest pain radiating to left arm → Myocardial infarction
  • Burning sensation after meals → GERD
  • Sudden sharp pain with dyspnea → Pneumothorax
Shortness of Breath
Key Questions
  • Is the difficulty in breathing constant or intermittent?
  • Any history of asthma, allergies, or smoking?
  • Associated with chest pain or cough?
  • Any recent travel or exposure to sick individuals?
Red Flags
  • Severe difficulty in breathing
  • Chest pain with breathing
  • History of deep vein thrombosis or pulmonary embolism
Differential Diagnoses
  • Asthma
  • Chronic obstructive pulmonary disease (COPD)
  • Pulmonary embolism
  • Congestive heart failure
Probable Diagnosis Clues
  • Wheezing and cough → Asthma
  • History of smoking and chronic cough → COPD
  • Sudden onset of dyspnea → Pulmonary embolism
  • Orthopnea and edema → Congestive heart failure
Palpitations
Key Questions
  • Is the sensation regular or irregular?
  • Any associated dizziness or fainting?
  • History of thyroid disease or heart conditions?
  • Any recent stress or stimulant use?
Red Flags
  • Syncope or near-syncope
  • Chest pain with palpitations
  • History of arrhythmias
Differential Diagnoses
  • Supraventricular tachycardia
  • Premature ventricular contractions
  • Hyperthyroidism
  • Electrolyte imbalances
Probable Diagnosis Clues
  • Episodes of rapid heart rate → Supraventricular tachycardia
  • Irregular heartbeats → Premature ventricular contractions
  • Weight loss and tremors → Hyperthyroidism
Dysphagia
Key Questions
  • Is the difficulty swallowing with solids, liquids, or both?
  • Any associated pain or regurgitation?
  • History of neurological disorders or stroke?
  • Any recent weight loss?
Red Flags
  • Progressive difficulty swallowing
  • Unintentional weight loss
  • History of head and neck cancer
Differential Diagnoses
  • Esophageal stricture
  • Achalasia
  • Esophageal cancer
  • Neurological disorders (e.g., stroke, Parkinson's disease)
Probable Diagnosis Clues
  • Difficulty with both solids and liquids → Achalasia
  • History of smoking and alcohol use → Esophageal cancer
  • Neurological symptoms → Neurological disorders
Burns
Key Questions
  • What was the cause? (flame, scald, chemical, electric)
  • When did it happen?
  • Any signs of inhalational injury?
  • Any past history of seizures or unconsciousness?
Red Flags
  • Burns on face, neck, chest (airway involvement)
  • Hypotension or altered sensorium
  • Circumferential limb burns (compartment syndrome risk)
Differential Diagnoses
  • Superficial burns (first-degree)
  • Partial thickness burns (second-degree)
  • Full thickness burns (third-degree)
  • Electrical burns with deep tissue damage
Probable Diagnosis Clues
  • Red, painful skin → First-degree burn
  • Blisters with intense pain → Second-degree burn
  • Painless, charred skin → Third-degree burn
  • Entry and exit wounds → Electrical burn
Scrotal Pain
Key Questions
  • Is the onset sudden or gradual?
  • Any trauma or sexual activity?
  • Is there swelling, redness, or fever?
  • Any urinary symptoms?
Red Flags
  • Sudden severe pain (torsion suspected)
  • Systemic signs (fever, vomiting)
  • Scrotal discoloration or absence of cremasteric reflex
Differential Diagnoses
  • Testicular torsion
  • Epididymo-orchitis
  • Inguinal hernia (strangulated)
  • Hydrocele with secondary infection
Probable Diagnosis Clues
  • Sudden pain, high-riding testis → Torsion
  • Pain + fever + dysuria → Epididymo-orchitis
  • Reducible groin swelling becomes painful → Hernia

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