 [ Symptoms ] women hair loss  can a thyroid condition cause hair loss and if so what can a person do to fix the thyroid problem [ Disease ] absolutely both over and underactive thyroid can cause hair loss if you thyroid is underactive and it is just a mild case sometimes you can get some help by eating kelp supplement usually you will need a doctor to give you supplemental thyroid hormone they will use blood work to see what is appropriate if your thyroid is overactive that makes things harder but it is still manageable