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The most common cause of this disease in human beings is the side effect of other diseases such as diffuse toxic goiter and Graves disease – Basedow, among others.

The most important component of the hormones produced by the thyroid (thyroxine (T4) and triiodothyronine (T3)) is iodine, which regulates the body’s energy and during the first years of life, regulates the growth, therefore an imbalance in the production of this hormone can bring about significant change physically.

Symptoms of this disease include: gastrointestinal problems, eg weight loss, hyperphagia or excessive increase of appetite, vomiting, nausea, diarrhea, and intestinal cramps, and also neuromuscular problems, such as fatigue, weakness muscle fatigue and tremors, cardiovascular problems, such as tachycardia, palpitations, dyspnea, and hypertension, among others.

In addition, symptoms such as increased pigmentation of the skin, heat intolerance, diaphoresis (excessive sweating), brittle hair, decreased libido, and decrease or cessation of menstruation. On a psychological level there are also symptoms of hyperthyroidism, such as irritability, anxiety, insomnia and decreased stress threshold bearable.

A clear external physical symptom of hyperthyroidism is the withdrawal of the lids, making it appear that the eyes are protruding and large.

The symptoms of this disease are variable, each individual may display differently, however, in the presence of these symptoms it is advisable to assist the doctor to appropriate examinations.