Low energy
If the patient also complains of constipation and polyuria consider hypercalcaemia.
If they have developed constipation, menorrhagia, or gained weight consider hypothyroidism.
If they have developed a deep tan, lost weight and feel nauseated and dizzy consider Addison’s disease.
If they have lost weight, feel nauseated and dizzy, but have not developed a tan, and have also lost libido or stopped having periods consider hypopituitarism.