Patients here can have very abnormal cortisol curves.
This one can happen when the body is under a lot of stress, either lifestyle related or from infections, toxicity, etc and the adrenals are pumping out too much he cortisol to help the body cope or tremendously overshooting, as in Cushing's disease:
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This is when the adrenals are not producing enough cortisol, in adrenal insufficiency or more profoundly, in Addison's disease.
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This is when cortisol production is shifted, so the person can't get out of bed in the morning but is awake at night, the classic night owl.
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There are strategies for treating each of these situations, best discussed with a doctor.