Causes and fixes for kitchen sink backing up

My kitchen sink is backing up again and I am sick of dealing with it every few weeks. Water just sits there and drains slowly. Before I call someone, I want to understand what might be wrong. Is there a guide that explains common causes and simple fixes for this issue?

Recurring kitchen sink backups can drive anyone crazy, I dealt with that for a long time before figuring it out. The main issue in my case was grease and food residue slowly building up inside the pipes, not just a single blockage. Even when water drained, the pipe diameter was already reduced. I started paying attention to what goes down the drain and used proper cleaning methods instead of temporary fixes https://bens.plumbing/blog/kitchen-sink-backing-up-heres-how-to-fix-a-slow-drain/ which helped me understand the real cause. After changing a few habits and doing a deeper clean, the problem finally stopped repeating every few weeks.