There are several reasons for acidity on the body: 1, the most common factor is infectious factors, whether bacterial infection, viral infection or fungal infection, will stimulate the body to produce inflammatory response, and will release lysozyme, bradykinin, prostacyclin to the blood and tissues, the above-mentioned substances will induce the body to produce clinical symptoms and performance of acidity and pain. 2, acidity and pain on the body and endocrine and metabolic 3, thyroid dysfunction, whether hyperthyroidism and hypothyroidism, there will be clinical symptoms of acidity. 4, heat stroke in the early stages of the body will also appear around the pain, no energy clinical symptoms and performance. 5, excessive lactic acid accumulation or lactic acid can not be metabolized from the body of the The clinical symptoms of lactic acid accumulation will also appear when the disease is caused by excessive exercise or over-exercise, resulting in long-term accumulation of lactic acid in the body.