If you suddenly feel cold, you should first consider whether you have a fever, which can be ruled out by measuring with a thermometer. If the body is cold for a long time or even in the opposite season, consider whether there is a disease that causes the chills. Hypothyroidism (hypothyroidism) is a common clinical condition that can cause chills. Because of hypothyroidism, the body’s metabolic rate decreases, resulting in poor blood circulation to the peripheral parts of the body. Some patients with very low blood pressure also feel cold, also because the blood circulation is slowed down and the blood in the peripheral parts of the body is not well circulated. It is also more common for female patients to have frequent chills, which should be considered for the presence of anemia, as it is also common in clinical practice for female patients to have excessive menstrual flow leading to anemia. Therefore, to specify which type of cause, it is best to go to the hospital for examination to confirm the diagnosis.