The promotion of plasma filtration when blood flows through the glomerulus is the result of a combination of factors, including the hydrostatic pressure of the glomerular capillaries and renal capsule, the colloid osmotic pressure of the glomerular capillaries and renal capsule, and the permeability of the glomerular filtration membrane. 1. Hydrostatic pressure: the hydrostatic pressure of glomerular capillaries is the blood pressure, and the hydrostatic pressure of the renal capsule is the pressure of the cystic fluid on the cystic wall. When the capillary pressure is greater than the hydrostatic pressure of the renal capsule, plasma filtration can be promoted, and vice versa, plasma filtration is hindered. 2. Colloid osmotic pressure: Colloid osmotic pressure is mainly formed by proteins in solution. When the colloid osmotic pressure in the capillaries is higher than that in the renal capsule, plasma filtration is hindered, and vice versa, plasma filtration is promoted. 3. Filtration membrane permeability: the components of the filtration membrane are capillary endothelial cells, basement membrane and podocytes, and it is the basement membrane that plays a major role. When the permeability of the filtration membrane increases, plasma filtration can be promoted, and vice versa, plasma filtration will be hindered. In case of discomfort, prompt medical attention is recommended.