The lower-than-normal blood uric acid may be caused by dietary factors, medication factors, and disease factors. 1. Dietary factors: a long time to eat a lot of vegetables and fruits, eat less meat food, resulting in insufficient protein in the body, it is easy to lead to the blood uric acid is lower than the normal value. 2. Drug factors: taking certain drugs for a long time, such as aspirin, allopurinol, etc., may affect the body’s blood uric acid level, resulting in low blood uric acid. 3. Disease factors: When there are some diseases, it is also easy to lead to a decrease in blood uric acid level, such as severe hepatitis, Wilson’s disease, multiple myeloma and so on. When blood uric acid is lower than normal and there are other obvious abnormal symptoms, it is recommended to go to the rheumatology and immunology department of regular hospitals in time to find out the cause and follow the doctor’s instructions for treatment.