11/08/2026
Why does the heat make me so sick and tired?
One of the key issues for lupus patients during the summer is photosensitivity, a condition where the skin reacts abnormally to sunlight. From 50% to 80% of lupus patients experience some form of photosensitivity, which can trigger skin rashes, flares, and systemic symptoms like fatigue and joint pain.
Heat can exacerbate lupus symptoms. High temperatures and humidity can increase fatigue, dehydration, and heat intolerance, making it harder for you to stay active and enjoy summer activities.
Heat makes you feel sick and tired because elevated temperatures increase blood flow and metabolic activity, which can amplify underlying immune system inflammation.
People with lupus often experience trouble regulating body temperature, high levels of nitric oxide that dilate blood vessels, and increased photosensitivity, turning standard warmth into severe physical exhaustion and flares.
Increased Inflammation:
High ambient temperatures speed up metabolic processes, which can stimulate an overactive immune system and worsen joint pain or swelling.
Blood Vessel Changes:
Research shows that people with lupus can have higher levels of nitric oxide, a chemical that widens blood vessels. This traps heat in the body and prevents effective cooling.
Photosensitivity:
Sunlight and UV rays frequently accompany heat, damaging cells and triggering systemic symptoms like deep fatigue, rashes, and low-grade fevers.
Medication Side Effects:
Certain prescriptions used to manage lupus can affect how your body sweats and handles temperature changes.
Ways to Cope and Stay Cool
Limit Peak Sun Hours:
Stay indoors during the middle of the day when outdoor temperatures and UV radiation are highest.
Hydrate Constantly:
Drink plenty of water to help your body regulate its core temperature and prevent dehydration-related fatigue.
Wear Protective Layers:
Choose loose, lightweight, and UV-protective clothing if you must go outside.
Use Cooling Gear:
Apply cold compresses or cooling neck wraps to lower your skin temperature quickly when you feel an energy crash coming on.
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SOURCES: Global Autoimmune Institute, Altus Biologics, Healthline, Johns Hopkins Lupus Center
This information does not constitute advice, always consult a medical professional.