Is there a connection between narcolepsy and hypothyroidism?
Yes, there are several connections between narcolepsy and hypothyroidism. Both conditions can occur together and share some important similarities.
Shared symptoms include
- Fatigue and excessive sleepiness
- Weight gain
- Depression
- Memory problems
- Sleep Show Full Answer
Is there a connection between narcolepsy and hypothyroidism?
Yes, there are several connections between narcolepsy and hypothyroidism. Both conditions can occur together and share some important similarities.
Shared symptoms include:
- Fatigue and excessive sleepiness
- Weight gain
- Depression
- Memory problems
- Sleep disturbances
Both involve autoimmune processes:
Type 1 narcolepsy is caused by autoimmune destruction of orexin-producing brain cells. Several types of hypothyroidism, including Hashimoto's thyroiditis, also result from autoimmune disease. Having one autoimmune condition increases your risk of developing others.
The hypothalamus connection:
Both conditions involve the hypothalamus, a brain region that controls metabolism and other vital functions. In narcolepsy, this area loses orexin-producing cells. The hypothalamus also regulates thyroid hormone production through a chain reaction involving the pituitary gland.
Metabolism and body fat:
Both conditions affect how your body processes energy. People with type 1 narcolepsy tend to have lower basal metabolism and more body fat, partially due to reduced brown fat activation by orexin. Similarly, thyroid hormones activate brown fat, which explains why hypothyroidism causes lower metabolism and cold intolerance. Why diagnosis can be tricky:
Because these conditions share so many symptoms, narcolepsy can be overlooked in people with hypothyroidism. Before modern thyroid testing, narcolepsy was regularly misdiagnosed as hypothyroidism. While simple blood tests can now rule out thyroid problems quickly, getting a narcolepsy diagnosis still takes an average of seven years.
A MyNarcolepsyTeam member shared: "For most people, it takes years to get diagnosed because the symptoms of narcolepsy can be a lot of other things, too. I'm 57 years old and didn't get diagnosed until 2006. I went to the doctor I don't know how many times complaining of all the symptoms I had. They would check my thyroid and blood, and nothing ever was wrong there, so they chalked it up as depression and put me on antidepressants."
If you're experiencing symptoms that aren't improving with hypothyroidism treatment alone, don't settle for "good enough." Keep advocating for yourself and asking questions until you find relief.
November 14, 2025
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