What can I do if I was fired without cause?

Without cause isn't automatically illegal

California's at-will rule cuts both ways: your employer generally doesn't owe you a reason at all, so the fact that none was given, or that it didn't make sense, isn't a violation by itself. What matters is the real motive behind the decision, not what's written on a termination form.

That said, a vague or shifting explanation is often the first sign something else is going on. If the stated reason changes over time, doesn't match how other employees were treated, or conveniently follows a complaint or medical leave, that pattern is worth examining closely.

What you can do right away

Ask for the reason in writing if you weren't given one, and write down your own timeline while it's fresh — what was said, by whom, and when. Being let go without cause generally does not prevent you from qualifying for unemployment benefits, since eligibility mainly turns on whether the reason involved misconduct.

From there, a consultation with an employment attorney can help you see whether the timing and circumstances point toward something the law would recognize as unlawful.