Hyperthyroidism is the situation that occurs because of excessive production of thyroid hormone by the thyroid gland. Thyrotoxicosis is the situation that occurs because of excessive thyroid hormone of any cause and therefore consists of hyperthyroidism. Some, however, use the terms interchangeably. Signs and signs and symptoms vary between humans and may consist of Nervousness, anxiety, Mood swings, Fatigue or weakness, Sensitivity to heat, A swollen thyroid, Losing weight suddenly, without trying, Fast or uneven heartbeat, Palpitations, Having greater bowel movements. Symptoms are commonly less inside the vintage and during pregnancy.