Rubella is an acute respiratory infection caused by the rubella virus. It is most often seen in children and is often prevalent in kindergartens. Patients may have a mild fever and may already have a mild cough and other respiratory symptoms. The rash begins within 1 day of fever and is distributed: now on the face, behind the ears, and rapidly spreads throughout the body. The rash is initially a sparse red papule, but later it becomes more and more frequent and can easily be misdiagnosed as measles, but often there is no rash on the palms of the hands and feet. On the second day, the rash fuses into patches, rather like a scarlet fever rash, and on the third day the rash begins to fade. Because the rash is similar to measles, the course of the disease is about 3 days and the name “three-day measles”. The rash is often accompanied by superficial lymph node enlargement, especially behind the ear, behind the occiput, lymph node enlargement is more common. Rubella has reduced signs and symptoms, and resembles the flu and hives, so it is not easy to attract attention. However, for pregnant women, rubella can cause fetal malformation, premature birth or death, so special attention should be paid.