What are the genetic and environmental factors that cause narcolepsy?

Reviewed by Yoshinori Abe, MD

Internal Medicine

The exact cause of narcolepsy remains unknown, but researchers have identified several risk factors. Genetic predisposition plays a role, particularly variations in the HLA-DQB1 gene, and certain infections—such as influenza (H1N1) and streptococcal infections—have been linked to a higher likelihood of developing the condition. Autoimmune responses that damage brain cells producing hypocretin (a wake-regulating neurotransmitter) are also believed to contribute.

If you're experiencing excessive daytime sleepiness, sudden muscle weakness, or other unexplained symptoms, don't guess—get clarity. A free, instant, and confidential symptom check can help you understand what may be behind your symptoms and guide your next steps, whether that means lifestyle adjustments or seeing a specialist. Early insight leads to earlier answers—and better outcomes.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Discover if your sleepiness suggests narcolepsy Learn likely causes of sudden daytime sleep attacks See whether fatigue points to narcolepsy today Find OTC options for daytime sleepiness relief Find a sleep specialist for narcolepsy care Understand medically valid home strategies for narcolepsy Find out if symptoms match narcolepsy signs

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Explanation

Narcolepsy is a sleep disorder that leads to excessive daytime sleepiness and sudden sleep attacks. While the exact causes of narcolepsy are currently unknown, some genetic factors and infections have been linked to an increased risk of narcolepsy. Genetic Factors: Research shows that narcolepsy occasionally runs in families, meaning it can be inherited. Also, certain genetic profiles have been linked to a higher risk of developing narcolepsy. For example, the HLA-DQB1*0602 genetic variant is found in most people with narcolepsy. Infections: Besides genetics, certain infections like the flu or streptococcal infection might play a role. Summary: The exact causes of narcolepsy are not currently known, but narcolepsy has been linked to some genetic factors and certain infections. If you're experiencing excessive daytime sleepiness or other concerning symptoms, try our free AI symptom checker to help identify potential causes and determine whether you should consult a healthcare provider for personalized medical advice.

(References)

Mignot E. (1998). Genetic and familial aspects of narcolepsy. Neurology, 9484418.
Thorpy M. (2001). Current concepts in the etiology, diagnosis and treatment .... Sleep medicine, 11152978.
Longstreth WT Jr, Koepsell TD, Ton TG, Hendrickson AF, & van Belle G. (2007). The epidemiology of narcolepsy. Sleep, 17310860.

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