There is a relationship between stress and hypothyroidism, yet particular yoga positions are thought to balance thyroids that are either underactive or overactive.A reliable source.

Multiple research investigations have demonstrated that yoga improves thyroid function. Remember that these poses will not fix your thyroid imbalance. Yoga is regarded as a supplemental therapy. It should not be used as a substitute for any other therapy or medication you are currently using.

The majority of these stances are known to stimulate the throat. They are said to promote thyroid circulation and energy flow, while also stretching and strengthening the neck.
Make sure you respect your body's limitations. Be kind with yourself. You can edit or modify the positions to meet your needs. You do not need to complete all of the poses in one session. You can try a couple of poses during the day.

1. Cat-cow position: The movement that occurs in cat-cow stance is thought to activate the thyroid. Drawing your chin into your chest and exposing your neck chakra increases blood flow to this area.

2. Legs-up-the-wall position: Viparita Karani, also known as legs-up-the-wall pose, is a restorative inversion. It is gentle on the neck and suited for the majority of people. It's a fantastic choice because it's passive and promotes equilibrium.

3. Supported shoulder stand: Shoulderstand is frequently recommended as the initial position for thyroid treatment. Because it is an inversion, it increases blood flow to the upper-body glands. This is thought to help the thyroid function more effectively. In addition, the way your chin is tucked into your chest in this position is thought to improve thyroid function.

4. Plow Pose: Plow posture is said to stimulate your thyroid in the same way as shoulderstand does. You may find it easy to perform the plow stance. This pose's Sanskrit name is Halasana. To perform the plow pose, start in the same way as a shoulder stand.

5. Cobra posture: Cobra posture provides moderate activation to the thyroid gland. It is not as intense as certain poses that require you to tilt your head all the way back. Having said that, it's fine to totally release your neck in this stance and let it fall back. 

6. Fish pose: Fish posture is an excellent alternative to shoulderstand. It's more approachable and can be completed on its own. Fish pose and shoulderstand are regarded as the most beneficial for improving thyroid function. Allowing your head to hang back in a fish stance stimulates your thyroid by revealing the throat.

7. Upward bow (wheel) pose: Wheel posture is thought to be a heart opening, meaning it boosts your energy. It also increases energy flow to the thyroid gland as your neck opens.