1 / 11The butterfly-shaped thyroid gland is situated at the front of the neck, under the voice box. Diseases of the thyroid gland are among the most abundant endocrine disorders worldwide, second only to diabetes. 1 in 10 people around the world will suffer from some form of thyroid disorder.2 / 11Thyroid diseases can affect more women than men. When thyroid gland makes too many hormones, it is called an overactive thyroid or hyperthyroidism.3 / 11 On the other an underactive thyroid where the gland doesn’t make enough hormones is referred to as hypothyroidism. Both of these imbalances can lead to a range of symptoms. On World Thyroid Day, here's all you want to know about the date, history, significance of the day apart from facts, types of thyroid disorders and symptoms of the disease4 / 11World Thyroid Day was first observed in 2007 by the members of the Thyroid Federation International. This global healthcare day was created to honour European Thyroid Association (ETA) which was formed in the year 1965.5 / 11The two most common types of thyroid disorders are hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid).6 / 11Hypothyroidism occurs when the thyroid gland does not produce enough thyroid hormones. Symptoms include weight gain, fatigue, dry skin, hair loss, among others.7 / 11An overactive thyroid gland could lead to hyperthyroidism. This happens when thyroid gland produces an excess of thyroid hormones. Common symptoms of the condition are weight loss, increase in appetite, increased heartbeat, anxiety, irritability, and heat intolerance.8 / 11Women are more likely to develop thyroid disorders than men.9 / 11Hypothyroidism is more common in elderly while hyperthyroidism affects younger people more.10 / 11Thyroid disorders can affect metabolism, energy levels, weight, heart function, fertility, mood, and cognitive function.11 / 11More than half of those with thyroid disease are unaware of their condition.Expecting mothers with undiagnosed thyroid issues face an increased risk of miscarriage, preterm delivery, and developmental problems in their children.If not treated early, thyroid disease can even cause heart disease, osteoporosis, and infertility.