Urine specific gravity measurement is used to estimate the concentration function of the kidneys, but its accuracy is poor and is influenced by many factors. Its measurement value is for reference only. Decreased urine specific gravity is seen in urolithiasis, chronic nephritis, etc. Chronic nephritis is a group of glomerular diseases with multiple etiologies of chronic glomerular lesions, but the cause is unknown in most patients, and there is no clear relationship with streptococcal infections, according to statistics, only 15-20% are transformed from acute glomerulonephritis, but because the subclinical type of acute glomerulonephritis is not easily diagnosed, the percentage may actually be higher. In addition, most patients with chronic nephritis do not have a history of acute nephritis, so more scholars now believe that there is no definite association between chronic glomerulonephritis and acute nephritis, which may be caused by various bacterial, viral or protozoal infections through immune mechanisms, inflammatory mediators and non-immune mechanisms. The prevention and treatment of urine specific gravity drop: 1, avoid overwork, mental stress: overwork, driving at night, exams and school stress, etc., can make the chronic nephritis condition aggravated. The actual fact is that you’ll be able to have good habits and maintain a regular life. The actual fact is that you will be able to get a good deal on your own, and you’ll be able to get a good deal on your own. Reasonable nutrition, enhance physical fitness and organism resistance. Pay attention to personal hygiene and environmental hygiene cleanliness, develop good habits of living hygiene, and keep a relaxed mood at all times to strengthen self-care awareness. 2, beware of bacterial or viral infections: bacterial or viral infections are the most common cause of acute nephritis, especially upper respiratory tract infections, asymptomatic bacteriuria, influenza, pharyngitis, tracheobronchitis, etc., may aggravate the symptoms of chronic nephritis. Actively prevent and treat infectious lesions and acute nephritis. The most important thing is to prevent the onset of cold and flu, purulent tonsillitis and septic skin infections, etc. Once infected with these diseases or acute nephritis and other primary glomerular diseases occur, prompt and thorough treatment should be given. The actual fact is that you will be able to get a good deal on your own. Pay attention to your own monitoring. Self-awareness of physical discomfort, such as the emergence of nocturnal urination, loss of appetite, lumbar discomfort or soreness, especially in the morning after waking up eyelids facial edema and urination abnormalities, it suggests the possibility of kidney disease, to promptly go to the hospital for examination, in order to facilitate early diagnosis and treatment, also has an important role in the prevention of this disease.