Before we delve into the symptoms of cortisol problems and the importance of having a cortisol test, we must first answer one vital question—why should we care about cortisol? Weight gain, overwhelming fatigue, difficulty sleeping, and a weakened immune system are just some of the symptoms brought about by adrenal fatigue on your body. When experienced for an extended period of time, it can cause problems for your physical performance and mental sharpness—meaning it could very well affect your quality of life. Despite its effects, there is little attention being brought to its primary cause. This is because the cause of adrenal fatigue, chronic imbalance of cortisol, can be mistaken as general fatigue or any other health problem.