I have students with thyroid gland problems. One has a problem with Hashimoto, another one has increased size of thyroid gland, one has lack of thyroid hormons.
In most classical Yoga books (like those of Swami Sivananda and Swami Vishnu-devananda) shoulderstand and fish are recommended if you have thyroid problems. Now I heard a few Yoga teachers say you should avoid these two postures in these cases. What is your opinion/your experience?