Increased heart rate
Since sunburns can cause widespread inflammation throughout the body, it’s not unusual for your resting heart rate to elevate slightly above normal. A rapid heartbeat, especially when combined with shallow breathing and feeling severely lightheaded, should not be ignored, as it could be a sign of heatstroke.
Eye pain
If you spend your summers by the water, make sure you’re also wearing sunglasses that protect against the sun’s harmful UVA and UVB rays. Thanks to water’s naturally reflective surface, it can magnify the sun’s rays directly into your eyes, causing a painful condition known as photokeratitis, or inflamed corneas.