Lethargy

Introduction

Lethargy refers to a decrease in consciousness. It is typically a symptom of a disease and has varied levels of medical seriousness.

Fatigue vs. lethargy – what’s the difference?

Fatigue is feeling physically exhausted or drained but without any disruption or impairment of your mental abilities. While people often use the term “lethargic” to describe someone who’s tired, fatigued, or drowsy, they’re not the same. Lethargy indicates something is affecting your brain, your level of consciousness, and other mental functions.

Causes

Alcohol intoxication and alcohol poisoning
Hypoglycemia and hyperglycemia
Brain bleeds
Chronic fatigue syndrome
Severe dehydration
Delirium
Electrolyte imbalances
Endocrine disorders
Hypothermia and hyperthermia
Head injuries
Infections

Treatment

Manage your chronic conditions.
Wear safety equipment.
Eat a balanced diet.
Stay physically active and reach and maintain a healthy weight.
Avoid substance and nonmedical drug use, and only use alcohol in moderation.