Certain physical health problems in the elderly population often result in impairment of cognitive abilities and acute behavioural issues, so pose a challenge to the treating team. The authors describe a case of hypothyroidism with psychological symptoms of general blunting of personality, mental lethargy and memory impairment from the early stages of the disease, with difficulty in recording events and happenings of day‐to‐day activities. They further describe how these resolve upon correction of the underlying physical health issues.