Source: Billion Photos/Shutterstock

I recently wrote about five ways to quickly bounce back from a "low-vibe day." I think of a low-vibe day as a day when you're feeling flat or emotional, but nothing major has happened to trigger that. Even though you might not have experienced any major negative events, there are often subtle causes of feeling "off" which can manifest as feeling lethargic, "flat," or antsy. Understanding these causes can help you better cope with these feelings. Let's run through a checklist of causes you can consider when you're feeling low.

Potential Causes of Your Unhappy Mood

Note that this article is focused on causes of malaise that you might overlook. If something major or tragic has happened, you're going to already know why you feel emotional.

As you read through this list, identify the three to four factors that tend to affect you most often. Pay particular to any points that affect you, but that you often overlook.

1. You're doing something new and/or challenging, and are experiencing fluctuating confidence and self-doubt.

Even when you're mostly sure you are on the right track, coping with these emotions can be very taxing.

2. You are feeling low-level but persistent physical pain.

This could be a minor injury, overuse pain, a headache, or just having slept in a funny position and woken up with an ache. Consider treating your physical pain. Minor but persistent pain can be extremely draining and make you feel irritable.

3. You're reacting to the media.

The types of media that can cause low-vibe days include news, dystopian literature, excessively materialistic reality TV, and anything that activates our fears of death, illness, or separation or gives us a sense of hopelessness or feeling out of control.

4. You've had a difficult, tense conversation, or you know one is on the horizon.

For example, you had to convey when you were unhappy with someone else's work. Or, you've attempted to make your position clear, but it doesn't seem to have been heard or accepted, and now you need to try to again. Even minor interpersonal stress can have a large impact, especially if you're prone to ruminating or taking excessive responsibility.

5. You're putting something off.

It's nagging at you, and your feelings of stress about it are snowballing.

6. You've experienced stress related to money.

This often includes several unexpected bills that appear all in a row.

7. You're experiencing changes.

You've got PMS or ovulation moodiness. Tracking your periods can help you know when this is the cause of your emotions.

8. There's something you're about coming up in your life.

For example, you need to have a photo taken for your company's new website, and you're hoping you don't get stuck with a bad photo.

9. You have a nutrient-related issue.

Low iron or low B-12 are common culprits.

10. You've taken a break, and now you need to get back into work.

You might be feeling post-vacation malaise, or you're returning to work after maternity leave. When you've taken a break, restarting can be difficult, and you might have lost in your abilities.

11. You're going through change or upheaval.

For example, your office is being renovated, or your work teams have been reorganized. Change affects some people more than others. If you're easily ruffled by change, know that this is quite a hardwired aspect of temperament, so don't be too hard on yourself about it.

12. Something is disrupting your sleep.

There might be a simple fix here. For example, you can change your thermostat's schedule if you're finding yourself waking up during the night from being too hot or cold. Or perhaps you need to use earplugs if noise is an issue.

13. You've been through a period of very hard work or stress, and you're exhausted from it.

The storm has passed, but you're still recovering. A key sign of this can be if you're not enjoying things much: For example, you're not excited about food or any of the entertainment you usually enjoy. You might finally have time to enjoy those things, but they just don't feel that pleasurable.

A long period of feeling like this can be indicative of , but a short period can happen when you're recovering from stress and your neurotransmitters are getting back into balance. Alternatively, you might've handled something and now are waiting to see how your "fix" works out. While you're waiting, you're feeling background anxiety that's draining you.

What to Keep In Mind