While we all have good days and bad days, some people seem to be more difficult on a regular basis than others.

Sometimes this seems to just be who they are from a personality point of view. They have a rather negative mindset. They're grumpy. They don’t smile much and just have a dark cloud that follows them around. Then there are others, who recently seem more touchy and easily offended than they usually are. Their moodiness can be confusing to others and offensive as well.

As a psychologist, I tend to notice how many people attribute others’ behavior and reactions (or even general life events) to their own actions. That is, we, in general, tend to attribute our actions as the cause for other events or reactions happening. Often this is not the case.

In fact, there is fairly good research showing that people tend to over attribute their influence on the world around them and even their own lives. By the way, this is the basis of superstitions - developing a habit of wearing the same shirt, jeans and sitting in the same place that you did when your team won a big game, hoping it will bring luck, and they’ll win again.

While I'm usually an advocate for individuals taking a look at their own behavior and accepting responsibility for their actions, in this case, I actually believe it’s best to put ourselves and our actions at the back of the line with regards to the potential reasons why our co-workers may seem prickly and easily offended.

Here are some alternative reasons to explore why your colleague may seem rather testy and annoyed.

1. They may not feel well.

Often people become surlier when they don’t feel well physically. This can come from lack of sleep, a medical issue they’re dealing with or chronic pain. It may be that they have started to struggle with migraines, lower back pain or some other issue. Many employees don’t talk about how they feel physically; and so, those of us around them don’t really know that they don’t feel well.

2. They may have issues going on in their personal life.

When we are dealing with stressful issues in our life, the emotional resources demanded to deal with these issues is significant, and we get worn out. Again, many people won’t share their personal issues; especially, if they are not asked about them. So there may be something going on in the background of your colleague’s life that you don’t know about.

Related: 8 Steps for Dealing With Angry Customer Complaints

This could include relationship difficulties, struggles with their children or adolescents, financial pressures or extended family issues. When we feel pressed in our personal life, many of us become more annoyed at work in response to what would otherwise be a normal demand.

3. They may feel anxious or fearful.

Irritability, a mild form of being angry or upset, can be a cover for other underlying thoughts and emotions. In our culture, many people have been taught - either directly or indirectly -- that it’s not appropriate to express negative feelings. Therefore, they try to keep those feelings inside. Two of these common feelings is anxiety and fear. Our culture has shaped most of us to believe that it’s not acceptable to be anxious or fearful. Therefore, we tend to suppress our feelings, and the anxiety is expressed through being prickly and grouchy in response to other people.

4. They may be frustrated.

Sometimes people become crabby when they’re frustrated either with their life, their job or some specific issue going on at work. Frustrated is an interesting word because it is used in two different ways in our culture.

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In many settings, when someone is frustrated, it is a nice way of saying they are a little bit angry. The other meaning of frustrated is to feel blocked - like you can’t reach the goal you are trying to achieve. Frustration can lead us to negatively react to any situation, regardless of whether it’s directly related to the issue about which we are frustrated. That is, we react in a quick-tempered manner to a situation that’s not directly related to what we are frustrated about.

5. They may not feel valued.

When employees don’t feel valued, either by their supervisor, management or their colleagues, a common response is for them to become increasingly irritable, moody and easily offended. One type of frustration is when we believe our colleagues should value what we do and contribute, but we don’t seem to hear much positive feedback.

In our work with the 5 Languages of Appreciation, we help individuals identify their primary language of appreciation; that is, the way in which they prefer to receive appreciation. Interestingly, we also found that employees are most easily offended when a message is sent - unintentionally -- via their primary language that hurts them in some way.

Related: 7 Steps to Defuse Workplace Tension

For example, people who value verbal praise are also quite sensitive to any critique or criticism. And those who value quality time are easily offended when they feel left out.

How should you respond?

While it is helpful to know possible reasons for the surliness of your colleagues, the question remains: What should I do?

A helpful response may be: I've noticed that you seem somewhat more easily annoyed recently. Are you okay? Is there anything going on that would be helpful for me to know about?

Conversely, it is not helpful to be accusatory or speak in a factual tone of voice, saying something like: You have been incredibly grouchy lately. What’s up with that?

Instead, frame your response in the sense of "It seems..." or “I’ve noticed...,” which makes your comment a bit softer. Then ask a question that communicates your concern for them, such as “Are you okay?”

Be forewarned, you may or may not get a positive response - especially immediately. Try not to react in a defensive or antagonistic way. In fact, what often happens is a colleague will come back to you later and explain what’s going on after they have thought about your inquiry and concern for them.