5. Fatigue
If you feel tired all the time, then it could be a sign of gluten intolerance. This is a really tough symptom to diagnose when it comes to determining why, because fatigue can be caused by so many different things. Obviously, everyone is going to be fatigued once in a while even if they are in perfect health. This is not the sort of fatigue you would experience after spending the day at work or from being under some sort of major mental strain.
The fatigue that can be attributed to gluten sensitivity is usually chronic and does not appear to have a fixed cause. In other words, you will find yourself feeling tired for no reason whatsoever. This can lead to trying to improve your energy levels with sugar, caffeine or other stimulants; which can cause a huge crash. Some people go through life experiencing regular fatigue without realizing that it is the gluten in their food that is causing it.