Lethargy may be a symptom of hyperparathyroidism, hypopituitarism, calcium imbalance, parasitic infections, asthma, hashimoto's thyroiditis' adrenal disease, amebiasis, sun poisoning, tapeworm, addison's disease, tuberculosis, endocarditis, farmer's lung, heart valve disease, mononucleosis, postpatum depresion and brucellosis. To learn more about the cause of your symptoms, click on each of the diseases listed below.
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