Touchpad acting up – any fixes?

So, here’s the situation—I haven't actually been using a standard mouse; I’ve been relying exclusively on my laptop's touchpad for everything. Up until now, it's been working perfectly fine. But then, out of nowhere, the left side just... quit on me. Specifically, the click function—both the physical press and the tap-to-click feature—isn't responding at all. The right side is still behaving normally, though. I can still slide my finger across the entire surface and see the cursor move on the screen without any issues, but the moment I try to click, nothing happens. A regular USB mouse works perfectly fine when I plug it in, so I know the software isn't totally frozen. Does anyone have an idea what might be causing this kind of hardware hiccup?