Thyroid hormone abnormality is mutual in foremost psychiatric disorders. Thyroid hormones play critical function in the method of Neurogenesis and Neurodevelopment i.e., Myelination, dendrite proliferation and formation of synapses. There is link among thyroid axis and several experienced psychiatric disorders. Noteworthy results on cerebral thyroid characteristic are observed while there are even small variations in thyroid hormone levels, within the normal range. Alterations in mood, behaviour and cognition are resulting from this. Depression, psychosis and cognitive disorder are observed in the patients of hypothyroidism. Meanwhile, people with hyperthyroidism had been observed to have psychosis, aggression, anxiety as well as cognitive impairment. Memory impairment is related with Subclinical hypothyroidism.