Why does the sun matter so much?
Sunlight, and some indoor light, can trigger lupus symptoms and flares.
The full answer, with the sources, is in the guide.
Sources
- Lupus Foundation of America: Common symptoms of lupus
- Arthritis UK (formerly Versus Arthritis): Lupus (SLE)
- NHS: Lupus
Reviewed 2026-11-09 · next review 2027-11-09