DDx

Acute HIV

• Mononucleosis
• Influenza
• Viral or bacterial pharyngitis

Constitutional symptoms

• Malignancy
• Tuberculosis
• Endocarditis
• Hyperthyroidism

Pulmonary symptoms

• Bacterial pneumonia
• Tuberculosis
• Viral pneumonia
• Fungal pneumonia, eg, coccidioidomycosis, histoplasmosis
• Interstitial lung disease, eg, idiopathic pulmonary fibrosis, pneumoconiosis

Neurologic symptoms

• Alcoholism
• Chronic meningitis, eg, tuberculous, fungal
• Neurosyphilis
• Cirrhosis (hepatic encephalopathy)
• Renal failure (uremia)
• Hyperthyroidism or hypothyroidism
• Vitamin deficiency

Diarrhea

• Infectious diarrhea
• Antibiotic-associated diarrhea
• Malabsorption syndrome
• Inflammatory bowel disease

See related DDx

• Fever
• Involuntary weight loss
• Altered mental status
• Chronic meningitis
• Chronic diarrhea
• Diarrhea in HIV/AIDS
• Pulmonary infiltrates in immunocompromised
• Renal failure in HIV/AIDS
• Fever of unknown origin (FUO) in HIV/AIDS
• Altered mental status in HIV/AIDS
• Oral lesions in HIV/AIDS
• Peripheral neuropathy and fever
• Peripheral neuropathy and weight loss
• Fatigue and weight loss
• Fatigue and fever