Fatigue is one of the major symptoms of hypothyroidism. It is often described as bone-numbing fatigue, caused by improper regulation of your thyroid levels. Since fatigue is also a sign of other serious or temporary health problems, it is better that you visit your doctor and get tested, otherwise you may ignore it and not be aware that you have hypothyroidism.
This fatigue can develop gradually or come on suddenly. According to health experts, it usually occurs in the morning and the person experiencing it can hardly lift their head from their pillow in the morning. This is clearly a problematic sign, as if you are healthy and well rested, you should feel refreshed in the morning.