Possible causes of Lethargy (Sluggishness)

21 conditions can cause this symptom. Most common are listed first.

• Alcohol (ethanol) overuse Common Urgent
• Anemia (low red blood cell count) Common Pediatric
• Dehydration Common Urgent Pediatric
• Depression (excessive sadness) Common Urgent
• Diabetes (elevated blood sugar) Common
• Drug overuse Common Urgent
• Infection Common Urgent Pediatric
• Meningitis (brain spine infection) Common Urgent Pediatric
• Obstructive sleep apnea (sleep apnea) Common
• Renal failure, acute (sudden kidney failure) Common Urgent
• Anorexia (eating disorder)
• Autoimmune disease
• Cancer (tumor)
• Chronic fatigue syndrome (CFS)
• Chronic liver disease
• Chronic pain
• Congestive heart failure (CHF) Urgent
• Insomnia (difficulty sleeping)
• Malnutrition Pediatric
• Narcolepsy (uncontrollable sleeping)
• Renal failure, chronic (kidney failure)