Recently, Cui Wei, the second hospital of Hebei Medical University, and others published a study covering nearly 122000 female nurses, suggesting that night shift significantly increases the risk of hypertension. Moreover, the frequency of night shift and age have a superimposed effect on the risk of hypertension. The more frequent the night shift, the older the age, the higher the risk of hypertension. The study showed that compared with nurses who did not work night shifts in the past half year, nurses who worked more than 5-10 and more than 10 night shifts per month had an increased risk of hypertension by 11.2% and 16%, respectively. Compared with nurses aged 18-25, nurses aged 26-35, 36-45 and 46-65 had an increased risk of hypertension by 14.8%, 2.127 times and 5.462 times respectively. For example, taking the 18-25-year-old nurses who did not work night shifts for nearly half a year as a reference, the risk of hypertension increased by 1.96 times, 1.923 times and 2.43 times respectively for the 36-45-year-old nurses who worked > 0-5, > 5-10 and > 10 night shifts on average every month. The risk of hypertension increased by 4.935 times, 6.398 times and 6.407 times for the 46-65-year-old nurses who worked > 0-5, > 5-10 and > 10 night shifts on average every month. The researchers believe that night shift may increase the risk of hypertension for the following three reasons: night shift will often be exposed to artificial light, which will lead to a decrease in melatonin secretion, thus leading to an increase in blood pressure; On the night shift, you may drink strong tea and coffee and eat irregularly; People who work night shift have occupational stress. The study covered 512 medical institutions in 11 cities of Hebei Province. The final analysis included a questionnaire survey of 121903 female nurses. The median age was 30 years old. The average number of people who worked night shifts 0 times, 0-5 times, 5-10 times and > 10 times per month accounted for 34.71%, 22.53%, 38.57% and 4.19% respectively. The prevalence rate of hypertension was 5.14%. (outlook new era)