24/06/2026
FIBROMYALGIA TEMPERATURE DYSREGULATION, EXCESSIVE SWEATING AND NIGHT SWEATS:
Current research suggests that excessive sweating and night sweats in Fibromyalgia are most likely related to autonomic nervous system dysfunction (dysautonomia). The autonomic nervous system controls involuntary functions such as:
* Body temperature regulation
* Sweating
* Heart rate
* Blood pressure
* Digestion
* Sleep-wake cycles
When this system becomes dysregulated, the body may overreact or respond inappropriately to temperature changes, stress, exertion, or sleep transitions, resulting in:
* Excessive sweating
* Night sweats
* Hot flashes
* Cold sweats
* Feeling hot and cold at the same time
* Difficulty regulating body temperature
Multiple studies have identified autonomic nervous system abnormalities in Fibromyalgia patients.
What Does the Research Show?
1. Fibromyalgia Is Associated With Dysautonomia
Researchers from the Mayo Clinic found that individuals with Fibromyalgia report significantly more autonomic symptoms than healthy controls, including symptoms related to temperature regulation and sweating.
A 2024 electrophysiological study again found evidence supporting autonomic dysfunction in Fibromyalgia patients.
RESEARCH SOURCE: https://journals.sagepub.com/doi/full/10.1177/09733698241284000?utm_source=chatgpt.com
2. Sweating Is Controlled By the Sympathetic Nervous System
A 2020 study examining sweat gland activity and skin conductance noted:
Sweating is exclusively controlled by sympathetic mechanisms.
The investigators found abnormal sympathetic nervous system function in women with Fibromyalgia compared with healthy controls.
This is important because if the sympathetic nervous system becomes unstable or overreactive, sweating can occur:
* With minimal activity
* During sleep
* During Fibromyalgia flares
* Without obvious heat exposure
RESEARCH SOURCE: https://pmc.ncbi.nlm.nih.gov/articles/PMC7595305/
3. Temperature Regulation Problems Are Common
Research has shown that Fibromyalgia involves abnormalities in autonomic regulation, including altered heart rate variability and sympathetic nervous system activity. These abnormalities may contribute to the “internal thermostat” problems frequently reported by patients.
Many patients describe:
* Feeling overheated when others are comfortable
* Profuse sweating with mild exertion
* Sudden hot flashes
* Night sweats despite a cool room
* Alternating chills and sweating
These symptoms are consistent with autonomic dysfunction.
RESEARCH SOURCE: https://pmc.ncbi.nlm.nih.gov/articles/PMC4766072/
What About Night Sweats Specifically?
Night sweats in Fibromyalgia likely have multiple contributing factors:
Dysautonomia: The autonomic nervous system normally reduces body temperature during sleep. Dysregulation may cause inappropriate sweating episodes during the night.
RESEARCH SOURCE: https://pmc.ncbi.nlm.nih.gov/articles/PMC4766072/
Sleep Disturbances: Fibromyalgia is strongly associated with disrupted sleep architecture and non-restorative sleep. Sleep instability may contribute to fluctuations in autonomic activity and nighttime sweating.
RESEARCH SOURCE: https://arxiv.org/abs/2503.10271
Pain and Stress Hormones: Chronic pain activates stress-response pathways involving the sympathetic nervous system. This heightened “fight-or-flight” state may increase sweating tendencies.
RESEARCH SOURCE: https://pmc.ncbi.nlm.nih.gov/articles/PMC7417433/
For many Fibromyalgia patients, sweating is not caused solely by Fibromyalgia but can be exacerbated by medications.
Several medications commonly prescribed for Fibromyalgia can cause excessive sweating and night sweats, including:
* Duloxetine (Cymbalta)
* Venlafaxine (Effexor)
* Milnacipran (Savella)
* SSRIs
* Tramadol
* Some migraine medications
If sweating began or worsened after starting a medication, it may be worth discussing with your physician. Community reports frequently identify SNRIs such as duloxetine as a trigger for severe sweating and night sweats.
When Night Sweats Should Be Evaluated
Because Fibromyalgia itself can cause sweating problems, it is easy to assume all sweating is Fibromyalgia-related. However, persistent or severe night sweats should be evaluated to rule out other causes such as:
* Menopause or perimenopause
* Thyroid disorders
* Sleep apnea
* Infections
* Certain cancers (rare but important)
* Medication side effects
* Blood sugar abnormalities
Medical literature increasingly supports a connection between Fibromyalgia and excessive sweating through autonomic nervous system dysfunction. Studies have demonstrated abnormalities in sympathetic nervous system activity, heart rate variability, skin conductance (a measure related to sweating), and other autonomic functions in Fibromyalgia patients. These abnormalities provide a biologically plausible explanation for excessive sweating, temperature dysregulation, hot flashes, and night sweats experienced by many people living with Fibromyalgia.
RESEARCH SOURCE: https://pmc.ncbi.nlm.nih.gov/articles/PMC7595305/
RESEARCH SOURCE: https://pubmed.ncbi.nlm.nih.gov/27152281/
RESEARCH SOURCE: https://pmc.ncbi.nlm.nih.gov/articles/PMC4766072/
For someone with your history of severe Fibromyalgia, chronic fatigue, migraines, Raynaud’s syndrome, and sleep disruption, autonomic dysfunction would be a very plausible explanation for episodes of excessive sweating or night sweats. However, it’s still worth discussing persistent symptoms with your healthcare provider to rule out medication effects or other medical causes.
