Hyperpermeability refers to an increased permeability of biological membranes, allowing substances to pass through more easily than normal. This condition can occur in various contexts, such as in the blood-brain barrier or intestinal epithelium, and is often associated with inflammation or injury. It can lead to the excessive entry of fluids, proteins, or pathogens into tissues, potentially resulting in edema or other pathological conditions. Hyperpermeability is a key factor in many diseases, including Allergies, autoimmune disorders, and infections.