Thyroid is one of the most important glands in our body. It regulates our body function and gives the balance to our well being. Certain Yoga postures can help to stimulate the thyroid gland to help its proper functions. Here is a few poses you can do at home : Plow, Bridge, Supported Shoulder stand and Fish. Remember to not push your body if you can not do a pose, instead try to modify it. I am also including a video I had found on this subject. This is a beautiful video but a little bit advance and NOT for EVERYONE. So, please, please I ask you not to force yourself to do exactly to detail these moves if you are not as flexible. You can do these exercises without having to fold your legs in lotus pose, and you can do these inversions by using props under your back so you can stay longer in the pose to get the benefit of stimulating thyroid gland but not hurting your back or neck.
Give it a try with gentleness in mind.