The sciatic tuberosity is an anatomical structure that can be clinically combined with the sciatic tuberosity to help determine diseases such as tenosynovitis, fasciitis, and tumors. 1. Tenosynovitis: The tendon sheath around the sciatic bone may have aseptic inflammation due to long-term strain. To cope with long-term pressure, there may be localized tendon sheath hyperplasia, resulting in sciatic node cysts. 2. Fasciitis: may be due to long-term exercise or strain, injury to soft tissues, fascia damage, fascial hyperplasia, local edema, thus appearing softer nodules. 3. Tumor: There may be lipoma, bone tumor, etc. present in the sciatic bone. Understanding sciatic nodule is helpful in diagnosing the disease.