A study conducted in 2009 by the Department of Endocrinology and Diabetes, Amrita Institute of Medical Sciences among 1000 women above 35 years of age in Kerala indicated thyroid functional disorders in 19.6 per cent. Significantly, the study found that 9.5 per cent of the total subjects had thyroid antibodies but they were asymptomatic or their hypothyroidism was sub clinical. Among those women in the study group who had hypothyroidism, the prevalence of thyroid antibodies or autoimmunity was 46 per cent.