Causes of Acidosis:

Several dietary and lifestyle factors can contribute to heartburn. These include overeating, food intolerances, over-consumption of acid-forming foods, pregnancy, smoking, wearing tight-fitting garments and obesity.
Metabolic acidosis is caused by abnormal metabolism and also because of various other complications like diabetes, kidney failure, severe dehydration and poisoning

Lactic acidosis results in an accumulation of lactic acid in the body. It can result from a great lack of oxygen owing to shock, heart failure or severe anemia, constant exercising, hypoglycemia, malignancy and liver failu