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Thyroxine is the main hormone that is produced into the bloodstream by the thyroid gland. It helps in digestion, heart and muscle function, brain development and maintenance of the bones. If it secretes insufficiently there could be major problems. If there is too much of it you may have overactivity of the thyroid gland such as Graves disease. Symptoms would include irritability, hair loss, tremors, tiredness, etc. If you have too little of it you can get hypothyroidism, where the thyroid is underactive. Symptoms of an underactive thyroid would be fatigue, low heart rate, weight gain, etc.

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12y ago

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