Sjögren's syndrome is a systemic autoimmune condition that primarily affects the moisture-producing glands — leading to dry eyes and dry mouth as its hallmark symptoms. It is one of the more common autoimmune conditions, affecting an estimated 1–4 million people in the United States, predominantly women.
This article provides an educational overview of Sjögren's syndrome and what research has explored about its relationship with vitamin D status.
What Sjögren's syndrome is
Sjögren's is an autoimmune disease in which the immune system attacks the exocrine glands — the glands that produce moisture. The lacrimal glands (which produce tears) and salivary glands are most commonly affected.
Sjögren's can occur on its own (primary Sjögren's) or alongside other autoimmune conditions such as rheumatoid arthritis or lupus (secondary Sjögren's). Diagnosis is typically made through blood tests (anti-SSA/Ro and anti-SSB/La antibodies), a Schirmer's test for tear production, and sometimes lip biopsy.
What dry eyes feel like in Sjögren's
Dry eyes in Sjögren's syndrome are typically described as:
— A persistent gritty or sandy sensation, as if something is in the eye— Burning or stinging, particularly in environments with dry air, wind, or air conditioning— Redness and irritation— Light sensitivity (photophobia)— Blurred vision that improves temporarily with blinking— Paradoxical watery eyes — a reflex tearing response to chronic dryness— Difficulty wearing contact lenses
Symptoms often worsen during the day as natural tear film depletes, and improve after rest or with lubricating eye drops.
Can Sjögren's affect vitamin D levels?
Yes — several mechanisms make low vitamin D more likely in people with Sjögren's syndrome:
Reduced sun exposure: Pain, fatigue, and photosensitivity (common in Sjögren's) may lead to less time outdoors and reduced sun exposure.
Malabsorption: If Sjögren's affects the gastrointestinal tract (as it sometimes does), fat-soluble vitamin absorption — including vitamin D — may be impaired.
Autoimmune and inflammatory processes: Chronic inflammation and immune dysregulation may affect vitamin D metabolism. Several studies have found lower vitamin D levels in Sjögren's patients compared to healthy controls, though whether this is causally related to disease activity remains under investigation. (Agmon-Levin N et al. Vitamin D in systemic and organ-specific autoimmune diseases. Clin Rev Allergy Immunol. 2013.)
What the research explores about vitamin D in Sjögren's
Research has explored whether vitamin D supplementation might influence Sjögren's disease activity, given vitamin D's immunomodulatory properties. Some small studies have found associations between vitamin D status and measures of disease activity. Larger controlled trials are needed before firm conclusions can be drawn.
Rheumatologists managing Sjögren's syndrome commonly check and, where necessary, address vitamin D status as part of comprehensive disease management.
A note on Mitolux and Sjögren's
Mitolux is a general wellness device. It is not a treatment for Sjögren's syndrome or any autoimmune condition. Individuals with Sjögren's who are interested in light therapy should consult their rheumatologist or ophthalmologist before use — particularly regarding eye protection, given the condition's effects on the ocular surface.
Disclaimer: Mitolux is intended for general wellness and self-care use. Individual experiences vary. This content is for informational purposes only and does not constitute medical advice. Mitolux is not intended to diagnose, treat, cure, or prevent any disease. Use only as directed. Consult a qualified healthcare professional before use if you have a medical condition, are pregnant, or take medications that increase light sensitivity.Important: This article is for educational purposes only. It does not constitute medical advice. Always consult a qualified healthcare professional before making any changes to your health routine, especially if you have an existing medical condition or take prescription medications.