Generalizzed weakness and vomiting differential diagnosis
Reading File
Finding Sources
Finding Sources
Finding Sources
Finding Sources
The library search has given me good anchoring content. I now have enough to provide a comprehensive, textbook-grounded differential. Let me synthesize.
Differential Diagnosis: Generalized Weakness + Vomiting
This symptom combination is broad but highly clinically important. Causes span multiple organ systems and urgency levels. The key is to systematically work through life-threatening causes first.
🔴 Critical / Life-Threatening (Exclude First)
| Condition | Key Features | Mechanism |
|---|---|---|
| Adrenal insufficiency (Addisonian crisis) | Hypotension, hyponatremia, hyperkalemia, hypoglycemia, hyperpigmentation (primary) | Cortisol deficiency → loss of vascular tone + GI manifestations |
| Hypercalcemia | "Stones, bones, groans, psychic moans"; confusion, polyuria, constipation | Neuromuscular depression; can be from malignancy, hyperparathyroidism |
| Hyponatremia (severe) | Confusion, seizures, coma | Cerebral edema; from SIADH, CHF, cirrhosis, Addison's |
| Diabetic ketoacidosis (DKA) | Polyuria/polydipsia, Kussmaul breathing, fruity breath, hyperglycemia | Osmotic diuresis + ketoacidosis → weakness + vomiting |
| Increased intracranial pressure | Headache, papilledema, projectile vomiting, focal neuro signs | Mass, hemorrhage, or meningitis compressing brainstem |
| Sepsis / Meningitis / Encephalitis | Fever, altered mental status, meningismus | Systemic inflammatory response; direct CNS invasion |
| Acute MI (especially inferior) | Chest/epigastric pain, diaphoresis, bradycardia (inferior MI) | Vagal stimulation; associated with nausea/vomiting |
| Acute mountain sickness / CO poisoning | Environmental exposure history | Hypoxia causing CNS and GI symptoms |
"Symptoms include anorexia, nausea, vomiting, weight loss, weakness, and fatigue. Orthostatic hypotension and... [high index of suspicion required]" — Washington Manual of Medical Therapeutics (re: adrenal insufficiency)
🟠 Serious / Urgent
| Condition | Key Features |
|---|---|
| Hypokalemia | Muscle weakness/cramps, ileus, arrhythmia; causes include vomiting, diuretics, hyperaldosteronism |
| Hypoglycemia | Diaphoresis, tremor, tachycardia, confusion; rapid resolution with glucose |
| Acute liver failure / hepatitis | Jaundice, RUQ pain, coagulopathy, elevated LFTs |
| Uremia (acute/CKD) | Azotemia, oliguria, pericardial rub, encephalopathy |
| Thyrotoxic storm | Fever, tachycardia, tremor, agitation, hyperthyroidism history |
| Myxedema coma | Hypothermia, bradycardia, altered mental status, hypothyroidism history |
| Acute pancreatitis | Epigastric pain radiating to back, elevated lipase/amylase |
| Guillain-Barré syndrome | Ascending weakness, areflexia, autonomic instability, recent infection |
| Myasthenic crisis | Ptosis, diplopia, fatigable weakness, respiratory failure risk |
🟡 Subacute / Less Emergent
| Condition | Key Features |
|---|---|
| Medication toxicity | Digoxin (nausea + weakness + bradycardia), opioids, anticonvulsants, chemotherapy |
| Hemiplegic migraine | Throbbing headache, reversible focal weakness, nausea/vomiting, photophobia — Kaplan & Sadock's Comprehensive Textbook of Psychiatry |
| Viral illness / gastroenteritis | Fever, diarrhea, myalgias, epidemiologic exposure |
| Anemia (severe) | Pallor, dyspnea on exertion, palpitations, fatigue |
| Malignancy | Weight loss, hypercalcemia of malignancy, paraneoplastic syndromes, cachexia |
| Chronic adrenal insufficiency | Fatigue, weight loss, hyperpigmentation, salt craving |
| Inflammatory myopathy (polymyositis/dermatomyositis) | Proximal muscle weakness, elevated CK, dysphagia |
| Depression / anxiety / somatization | Exclusion of organic causes; fatigue + GI symptoms common |
Systematic Diagnostic Approach
History priorities:
- Onset and duration (acute vs. subacute vs. chronic)
- Medications / recent changes
- Endocrine history (diabetes, thyroid, adrenal)
- Fever, travel, infectious exposures
- Headache, visual changes, focal neuro deficits
- Orthostatic symptoms (adrenal/fluid depletion)
Initial workup (first pass):
- BMP (Na, K, glucose, BUN/Cr, HCO₃)
- CBC, LFTs, calcium, phosphate, magnesium
- TSH, cortisol (morning or stimulation test if adrenal insufficiency suspected)
- ECG (inferior MI, arrhythmia, digoxin toxicity)
- Urine/blood glucose + ketones if diabetic
- CT head if ICP concerns
Red flags requiring immediate action:
- Hypotension + hyponatremia + weakness → adrenal crisis (give hydrocortisone empirically)
- Severe hypercalcemia (>14 mg/dL) → aggressive IV fluids + bisphosphonate
- New focal neuro signs + vomiting → CT/MRI head urgently
- Ascending weakness + areflexia → Guillain-Barré, check LP + NCS
The combination of generalized weakness and vomiting is a classic presentation of adrenal insufficiency, electrolyte disturbances (especially hyponatremia, hypokalemia, hypercalcemia), and DKA — these should be at the top of any emergency differential. — Washington Manual of Medical Therapeutics; Goldman-Cecil Medicine; Rosen's Emergency Medicine
This is a shared conversation. Sign in to Orris to start your own chat.