“…These symptoms with the cognitive impairment might be increased with the age progress (Mallett et al, 1995;Dugbartey, 1998). On the other hand, there are other psychiatric symptoms during the hyperthyroidism such as depression and anxiety (Demet et al, 2002), abnormalities in the appetite and sleep, emotional lability, exaggerated sensitivity to noise, distractible overactivity, and impatience or irritability (Awad, 2000). Additionally, in the elderly, Alzheimer's disease (AD), dementia, and cognitive defects were observed in the subclinical hyperthyroidism (Kalmijn et al, 2000;van Osch et al, 2004;Wijsman et al, 2013).…”