The normal color of urine should be a light yellow, clear liquid. The color of urine generally depends on the amount of urochrome, the so-called urochrome is the product of combining urobilinogen or urobilin with peptides in the organism. The color of urine in normal people can be affected by the amount of water drunk, certain foods or drugs, such as anxiety and fire, drinking less water, sweating more in summer and concentrated urine, the color of urine, especially yellow, can be aggravated. The color of urine can be bright yellow if you eat a lot of carrots, citrus, when you take vitamin B2 and the herbal medicine Sando Nian. If dysentery and rhubarb are taken, the urine color can be dark yellow or brownish. If you take rifampin, apply phenol red or eat too much red heart dragon fruit, the urine can be various degrees of red. If methylene blue is applied intravenously, the urine can be blue-green. All of the above are normal physiological changes.