the digestion after a meal climax, dilatation of the stomach
and vomiting caused by excessive gastric acid discharge;
and the loss of renal tubule when alkali. Uric acid is a common cause of acid: the general reason for the urine are acidic; strenuous exercise, sweating after the protein decomposition in vivo when strong (hunger); pathological causes, such as nephritis, diabetes, acidosis, etc..