Harris County Sheriff Ed Gonzalez said there is an unknown odor at an industrial site "causing some to experience headaches and nausea."

One neurologist said she can tell by the weather forecast when she’ll be busy at work because stormy weather tends to increase migraines.

Blue light filters, like an anti-glare, you can add this filter to your prescription. Blue light glasses - you can order glasses with lenses to filter blue light and wear when you’re on devices. How can I reduce blue light without buying into a product? Eye strain: Digital eye strain is not caused by blue light. You put them on, they tell your brain the sun is setting,” she explained how she believes her blue light blockers work.