Feeling tired amid seasonal changes or a busy daily routine is common. However, if your body feels heavy even after sufficient rest, or if you gain weight despite no significant increase in food intake, or if your face, hands and feet swell, it is hard to dismiss as a simple dip in condition. If these changes persist for a long time, hypothyroidism may be suspected.
The thyroid is a butterfly-shaped endocrine organ located in the center of the front of the neck. The thyroid hormones produced here regulate the body's metabolism, including energy use, body temperature and heartbeat. Hypothyroidism is a condition in which the body does not produce enough thyroid hormone for its needs, and various symptoms appear as if the body's overall pace has slowed.
The first noticeable change is fatigue and lethargy. In many cases, people do not feel refreshed even after sufficient sleep and tire easily even at their usual activity levels. Being unusually sensitive to cold can also be a sign of reduced thyroid function. As thyroid hormone decreases and metabolism declines, a person may feel cold at temperatures others find comfortable, or experience cold hands and feet. Symptoms may also include reduced appetite alongside weight gain, and swelling of the face, hands and feet. In addition, the skin may become dry and rough, and hair may thin or fall out easily. Frequent hoarseness or difficulty producing high notes is also among the symptoms of hypothyroidism. This is because when thyroid hormone is insufficient, water and mucous substances are not properly discharged from the body and accumulate in the mucous membranes of the vocal cords and larynx, which can interfere with the smooth vibration of the vocal cords. Slowed bowel movement can cause constipation and a persistent feeling of poor digestion, and the condition is also closely related to overall health, with effects such as a slowed pulse or elevated blood cholesterol levels. Patients may feel that their memory is not what it used to be or find it difficult to concentrate on work, and some report depression. Women may experience irregular menstrual cycles or changes in menstrual flow. Those who are preparing for pregnancy or are pregnant require more careful management, as thyroid hormone can also affect the growth and development of the fetus. A common cause of hypothyroidism is Hashimoto's thyroiditis, a type of autoimmune disease. A history of thyroid surgery or radioactive iodine treatment, or the use of certain medications, can also be a cause.
Hypothyroidism can be diagnosed relatively simply by measuring the levels of thyroid-stimulating hormone and thyroid hormone in the blood. When thyroid function declines, the pituitary gland stimulates the thyroid more strongly to make up for the insufficient hormone, and in this process the level of thyroid-stimulating hormone rises. Conducting a thyroid autoantibody test or ultrasound examination together can confirm the presence of thyroiditis and structural changes. The symptoms of hypothyroidism that appear externally can vary with age. In older adults, fatigue, memory decline, depression and reduced muscle strength tend to appear before typical symptoms, making it easy to mistake the condition for simple aging. Conversely, since discomfort is not pronounced in the early stages, it is sometimes discovered incidentally during a health checkup. Therefore, if unexplained fatigue and reduced condition recur, it may be necessary to consider a thyroid function test.
The basis of treatment is to supplement the insufficient thyroid hormone with medication. Generally, patients take a thyroid hormone preparation daily, with the dose adjusted while monitoring blood test results and changes in symptoms. If patients take the medication consistently and hormone levels are maintained within the normal range, most symptoms can improve. However, arbitrarily stopping medication because symptoms have improved can disrupt the hormone balance again, so patients must follow their medical team's instructions.
Thyroid hormone preparations can be affected by food and certain medications such as iron supplements, calcium supplements and antacids, so it is best to take them regularly on an empty stomach at a fixed time. Combining regular sleep, a balanced diet and exercise within reasonable limits helps maintain overall health. However, since hypothyroidism is not a disease that can be resolved through lifestyle habits alone, medication and regular follow-up management are essential. In particular, since a seaweed-centered diet high in iodine or health supplements with high iodine content can affect thyroid function, it is safer to consult a specialist in advance.
Hypothyroidism is a disease that can be sufficiently managed while maintaining daily life if diagnosed early and treated appropriately. However, because symptoms appear gradually, they are easily mistaken for aging, fatigue or stress. If unexplained fatigue, weight gain, cold sensitivity, swelling, constipation and dry skin persist together, it is advisable to seek proper management through accurate examination and diagnosis.
