Varicocele leads to increased sperm abnormality rate, while other indicators are normal. The main reasons include temperature change, testicular injury, abnormal blood supply, etc. 1. Temperature change: Varicocele causes local blood vessel dilation, which will cause the body temperature of the neighboring tissues to rise, and the growth and development of spermatozoa will be affected in a relatively high temperature environment, which will further lead to an increase in the malformation rate. 2. Testicular damage: varicose veins will cause local blood stagnation and decreased blood circulation, which will further lead to the waste in the neighboring tissues can not be completely drained, which will cause certain damage to the testicular tissues, affecting the sperm development. 3. Abnormal blood supply: tortuous veins can cause a decline in blood supply, which further leads to a decrease in energy intake by the surrounding tissue cells, causing a decline in function and an increase in sperm deformities. There may be other reasons for the high malformation rate of varicocele, and patients need to consult a doctor in time for examination and early treatment.