What is one common cause of drain blockage?

One common cause of drain blockage is the accumulation of debris, root intrusion, grease buildup, and improper installation. This answer encapsulates the various factors that contribute to drain issues. Over time, materials such as leaves, dirt, and other foreign objects can gather in the drainage system, leading to significant clogs. Additionally, tree roots can infiltrate underground pipes, seeking moisture and causing blockages as they grow. Grease buildup from cooking and washing can solidify within pipes, narrowing the passage and slowing water flow, ultimately creating a blockage. Lastly, improperly installed drainage systems may lead to insufficient flow or misaligned pipes, which can exacerbate clogging issues. This comprehensive understanding of multiple causes aligns with the knowledge needed for effective drain maintenance and remediation.