PICC is a central venous catheter inserted by peripheral vein puncture, with the tip positioned in the superior vena cava or subclavian vein, used to provide medium- to long-term intravenous fluids for patients, mainly for patients who need long-term intravenous fluids or blood collection, patients who need to be infused with stimulating drugs, such as chemotherapy patients, patients requiring parenteral nutritional support, patients whose peripheral vasculature is poorly conditioned and unsuitable for daily independent intravenous infusion, as well as long-term bedridden patients, premature infants. patients who have poor peripheral vascular conditions not suitable for stand-alone intravenous fluids, as well as patients who are bedridden for long periods of time, and preterm infants. ‘Common diseases that require intermediate and long-term treatment and require PICC include osteomyelitis, pneumonia, endocarditis, AIDS, cancer, cellulitis, etc.’ It is worth noting that the affected limb after breast cancer surgery is not suitable for PICC, and those with poor venous vascularization conditions in the elbow are also not suitable for PICC. PICC can effectively reduce the pain of patients who need long-term intravenous infusion, but need to pay attention to nursing care to avoid infection.