Symptoms of hyperthyroidism to hypothyroidism mainly include hypometabolic syndrome, psychoneurologic symptoms, skin changes, digestive system symptoms, etc. 1. Hypometabolic syndrome: mainly manifested as low sweat and fear of cold, easy fatigue, weight gain, slow speech, slow movement, etc. 2. Psychoneurological symptoms: mainly including loss of attention, memory, comprehension, slow reaction, drowsiness; in severe cases, there may be fantasies, dementia, fainting, convulsions. 3. Skin changes: mainly manifested as dry, rough, flaky skin, sparse hair, thick and brittle nails, cracked nails, ginger-colored skin on hands and feet. 4. Digestive system symptoms: mainly including constipation, diarrhea, loss of appetite; a few people will have paralytic intestinal obstruction. Symptoms of hyperthyroidism to hypothyroidism are more diversified, not only including the above, if hypothyroidism symptoms, should be timely medical examination and treatment.