Do you feel tired and cold? You may have Hypothyroidism. Also called underactive thyroid or low thyroid, Hypothyroidism is a disorder of the endocrine system in which the thyroid gland does not produce enough thyroid hormone. It can cause a number of symptoms, such as poor ability to tolerate cold, a feeling of tiredness, constipation, depression, and weight gain. Bioresonance therapy may rebuild your energy level by stimulating the white blood cells to produce more energy. This is done by sending healthy frequencies into your body. Bioresonance therapy is completely painless and non-invasive.