Gastritis is an inflammation of the stomach lining, causes stomach upset, irritation, and pain. Aseptic meningitis (adult) Aseptic meningitis, or viral meningitis, can cause fever, headaches, neck pain, nausea, and more. Aseptic meningitis (child) Aseptic meningitis, or viral meningitis, can cause fever, headaches, neck pain, nausea, and more. Sunburn