Cause : It is caused due to the excessive secretion of thyroxine.

Symptoms :

The disease is characterised by increased rate of metabolism, bulging of eyeballs, increased blood pressure and excessive perspiration.

2. Iodine Deficiency Goitre :

Cause : It is caused due to the lack of iodine in food.

Symptoms : It causes enlargement of thyroid gland. It occurs mostly to the people of hilly areas.

 
3. Cretinism :

Cause : It is caused due to hyposecretion of thyroxine in children.

Symptoms :

The person suffering from cretinism shows
stunted growth, mental retardation and low blood pressure.

4. Myxoedema :

Cause : It is caused due to the hyposecretion of thyroxine in adults.

Symptoms :

The affected person shows low metabolic rate, body temperature, mental retardationand weakness.