Hashimoto's disease (aka, or thyroiditis, is an autoimmune disease affecting thyroid function. It is one of the most common causes of hypothyroidism and fortunately, quite treatable. Basically, the body attacks the tissues of the thyroid, causing symptoms of an under active (depression, weight gain, fatigue) and overactive (anxiety, insomnia, weight loss, heart palpatations) thyroid intermittently. Getting plenty of exercise on a regular basis is another basic when it comes to promoting efficient metabolism and hormonal balance. Daily walks, riding bicycle and swimming are all good options. Yoga is also helpful for those suffering from thyroid conditions because it has specific postures that massage the thyroid and have the effect of helping promote optimal function.