Lybrate-user, madam thyroid is the normal gland present in all of us, it produces hormone thyroxine, essential for development and functioning of brain, plus essential for almost all vital metabolic activities in the body. Deficiency of that hormone causes hypothyroidism and excess causes hyperthyroidism. Why thyroid disease occur is difficult to explain. There are many reasons including auto immune causes (hashimoto's disease - causing hypothyroidism), iodine deficiency leading to goitre and hypothyroidism. Radiation, environmental causes, heredity etc.
All the conditione related to thyroid gland can only be treated and controlled. There is no cure. Treatment is for lifetime.
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