When you are the new person on a team, it can be hard to tell if your bosss rude, brusque behavior is the result of a bad day or if they have a habit of creating a toxic environment of fear and anxiety for their employees.

A difficult boss who is micromanaging can be reasoned with. But a toxic boss who lacks empathy can wreck your physical and mental health , causing you to lose sleep and dread each workday.

Sometimes, you may not be able to spot toxic behavior right away, but often it is possible to identify a toxic boss who will make your work life hell and drive you out of your job.

Here are some of the biggest warning signs that the friendly boss you met in your job interview may have a toxic side:

1. Your boss is quick to bad-mouth the person you just replaced

Angela Karachristos , a career coach who has worked in human resources, said one subtle sign new employees can notice is when their new boss bad-mouths the team members who have left.

If youre new and your new boss is still hung up on why someone left, and is still taking it personally, thats one sign that you can spot early on, Karachristos said. It brings to light that the manager doesnt separate their personal feelings about an employee from the work that they did or [the employees] own need to move on.

The public bad-mouthing is also passive-aggressive because it signals that behavior is unacceptable without telling you directly, Karachristos said. They are not telling you what their expectations are, but they are using the past employee as an example.

2. Your boss will congratulate themselves, but will not praise anyone else

One way to suss out toxic boss behavior is to see how hard work and team wins get rewarded. Do you get a thoughtful message of support after completing a big project, or do you get radio silence?

If you are noticing that your boss says nothing when you win but makes a big deal about their own accomplishments, thats a worrying red flag of potential toxicity.

One type of toxic boss is a narcissistic boss. These are individuals who are basically incapable of caring for others or showing genuine interest in those working for them. Instead, they tend to be disconnected from others, said Alan Cavaiola, a clinical psychologist and co-author of Impossible to Please: How to Deal With Perfectionist Coworkers, Controlling Spouses, and Other Incredibly Critical People . The narcissists will expect praise and adulation from others but are unable to give it to deserving staff.

3. Your boss keeps ignoring you