Hypothyroidism (hypothyroidism) is a disease in which the body’s metabolism is reduced due to a decrease in the synthesis and secretion of thyroid hormones or a lack of their physiological effects. According to its cause, it is divided into three categories: primary hypothyroidism, secondary hypothyroidism and peripheral hypothyroidism. Regardless of the type of hypothyroidism, the following manifestations are easily misunderstood in real life: 1. Edema is often misunderstood as a result of kidney or heart disease. It is often preceded by anterior tibial edema, and in severe cases, generalized edema, accompanied by chilliness, heavy legs, lumbar weakness, poor spirit, weakness and drowsiness. In mild hypothyroidism or subclinical hypothyroidism (only TSH is elevated, other indicators are normal), there is often no obvious edema, only easy fatigue and intolerance to work. 2. Decreased physical fitness, fear of cold and easy to catch cold Often misunderstood as kidney deficiency or rheumatic pain. Patients show no increase in food intake, weight gain, white and fat face, easy to catch cold repeatedly, accompanied by general joint pain, cold, etc. 3. Change in temperament Often misunderstood as aloofness or anxiety disorder. Many people know that patients with hyperthyroidism have an impatient and irritable temperament. In fact, patients with hypothyroidism can also suffer from insomnia, depression, temper tantrums, memory loss and slow reaction time. 4. Menstrual disorders are often misunderstood as menopausal syndrome. Many middle-aged women have complaints of “dry skin and menstrual disorders” when they visit the doctor.