Recently, there are more patients coming to the nephrology specialist clinic for back pain, frequent urination, urgent urination, painful urination, and hematuria; others do not have any symptoms but come to the clinic for dark and cloudy urine. After routine urinalysis, occult hematuria, microscopic hematuria, carnal hematuria, acid urine, high specific gravity urine, microalbuminuria, leukocyturia, and bacteriuria were more common. The age group shifted toward younger people, and the gender was a tendency for more male patients than before. Summarize a few major factors of the onset, I hope you will be warned: Heilongjiang Provincial Hospital, Department of Nephrology, Cheng Xiaoxia increased water loss into the summer, high temperature climate, the body’s unobtrusive water loss (affected by body temperature, temperature, humidity and other conditions), such as skin evaporation (normal about 500 ~ 600 ml / day), respiratory consumption (lung exhalation normal about 300 ~ 400 ml / day) increased, if not pay attention to increase If we do not pay attention to increase water intake and hydration, it will cause blood concentration, decrease in urine volume, concentration of urine, increase in the proportion of the number of solutes in urine, increase in specific gravity, and increase the chance of forming crystalluria (such as urate crystals), which will then cause damage to renal tubular epithelial cells and urinary tract mucosa, resulting in hematuria.