<unk>  is one symptom of Astrocytoma. Shown above is a PET scan of hypermetabolic Astrocytoma in the brain. Many different illnesses can cause an increase in metabolic activity as the body combats illness and disease in order to heal itself.<unk>  is a common symptom of various pathologies. Some of the most prevalent diseases characterized by<unk>  are listed below. * Hyperthyroidism: Manifestation: An overactive thyroid often causes a state of increased metabolic activity. * Friedreich's ataxia: Manifestation: Local cerebral metabolic activity is increased extensively as the disease progresses. * Fatal familial insomnia: Manifestation:<unk>  in the thalamus occurs and disrupts sleep spindle formation that occurs there. * Graves' disease: Manifestation: Excess hypermetabolically-induced thyroid hormone activates sympathetic pathways, causing the eyelids to retract and remain constantly elevated. * Anorexia and bulimia: Manifestation: The prolonged stress put on the body as a result of these eating disorders forces the body into starvation mode. Some patients recovering from these disorders experience<unk>  until they resume normal diets. * Astrocytoma: Manifestation: Causes hypermetabolic lesions in the brain
Hypermetabolism
Osteomimicry
Adiadochokinesia
Alpha cell hyperplasia
Starvation
Hypoestrogenism
Corticosteroid-induced lipodystrophy
Neuroendocrine hyperplasia