The differences between fibroids and cysts are as follows: 1. The causes of the two are different: fibroids are caused by genetic mutations or genetic variations, while cysts are generally caused by bacterial infections and inflammation, resulting in the formation of abnormal proliferation of material. 2. The two have different growth rates, with fibroids taking years to grow slowly, but cysts growing faster and generally reaching their maximum level in a few months. 4. The degree of impact on the body is different, with fibroids causing more damage to the body and cysts affecting the body less.