Why do I need a thyroxine test?Thyroid disease is much more common in women and most often occurs under the age of 40. It also tend to run in families. You may need a thyroxine test if a family member has ever had thyroid disease or if you have symptoms of having too much thyroid hormone in your blood, a condition called hyperthyroidism, or symptoms of having too little thyroid hormone, a condition called hypothyroidism.Symptoms of hyperthyroidism, also known as overactive thyroid, include:AnxietyWeight lossTremors in the handsIncreased heart ratePuffinessBulging of the eyesTrouble sleepingSymptoms of hypothyroidism, also known as underactive thyroid, include:Weight gainFatigueHair lossLow tolerance for cold temperaturesIrregular menstrual periodsConstipation
