### What is Solar Urticaria? Solar urticaria is a rare allergic reaction to sun exposure. It causes an itchy rash or hives on any skin exposed to the sun. The more skin exposed, the more severe the reaction. ### Symptoms Symptoms include a sudden rash or hives, headache, fatigue, nausea, changes in heart rate, and breathing issues. In rare cases, it can lead to anaphylaxis, a life-threatening condition. ### Causes The exact cause is unknown, but it's believed to be an immune reaction where the body mistakenly identifies sun-affected cells as foreign. ### Who is Affected? It can affect anyone but is more common in people with lighter skin, women, and those in their mid-30s. ### Management There is no cure, but symptoms can be managed by: - **Avoiding Sun Exposure:** Wear protective clothing and stay indoors during peak sunlight hours. - **Sunscreen:** Use sunscreens that block UVB rays, containing ingredients like titanium and zinc. - **Antihistamines:** These can help control outbreaks by managing histamine release. - **Phototherapy:** Controlled light exposure can build tolerance over time. - **Asthma Medication:** Some asthma medications can help. - **Immune Therapy:** In severe cases, immune-suppressing medications may be needed. ### Prognosis In rare cases, solar urticaria can go away completely. About 15% of people recover spontaneously within 5 years, and 25% within 10 years. ### Impact on Life Managing solar urticaria can be challenging and may affect your quality of life. Consult your doctor for support if it impacts your mental health.