Headache

Today, I'm getting some serious headache and I think it's due to the smells that I have been inhaling. I often get headaches due to perfumes or other strong smells like cleaning agents. I was wondering why... The most common reason seems to be that it's a mental overload. Basically, there's too much information to process. While this sounds plausible, I couldn't find any detailed studies on this hypothesis. My guess is that headache and sensory overload are two ideas that are both difficult to quantify and objectively determine.