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Hair loss can occur in individuals who have either an over- or underactive thyroid. Hypothyroidism (underactive) occurs when there is an insufficient amount of thyroid hormones, whereas hyperthyroidism (overactive) involves overproduction of the hormone. Because the thyroid hormone places a significant role in the development of hair follicles, too much or too little of the hormone can cause the system to switch to a state of telogen effluvium, a condition that causes hair roots to be pushed prematurely into the resting stage of the hair growth cycle. This can result in as much as 70 percent of scalp hairs to fall out within 2 months.