Let’s start with the most ordinary word on the list: stress. Normal stress is your body responding to a real demand, like a deadline, a sick kid, or a hard conversation. Your heart speeds up, your focus sharpens, and when the demand passes, your body settles back down. This kind of stress is not a malfunction; it is your body doing exactly what God designed it to do. The problem is not stress itself. The problem is stress that never gets to end.

Chronic stress (stress that stays switched on for weeks, months, or years) is a different animal. When the pressure never lets up, your body never gets the “all clear” signal, so it keeps running its emergency systems around the clock. Researchers who study long-term stress have found that this constant activation wears on nearly everything: sleep, digestion, memory, mood, even the immune system. If normal stress is sprinting to catch a bus, chronic stress is being told to sprint for a year. Nobody is weak for breaking down under that. Bodies are simply not built for it.

Burnout is what happens when chronic stress, usually from work or caregiving, hollows you out in a specific way. Christina Maslach, a psychologist who spent her career studying it, found that burnout has three ingredients. First, exhaustion: you feel drained no matter how much you rest. Second, cynicism: you start feeling detached, irritable, or numb toward the very people and work you used to care about. Third, a shrinking sense of accomplishment: you feel like nothing you do matters or makes a difference anymore. Tiredness alone is not burnout. Burnout is tired plus detached plus defeated.

Anxiety deserves its own careful look, because some anxiety is normal and useful. Feeling nervous before a job interview is your brain taking the moment seriously. Anxiety becomes a problem when it outlives its trigger. The interview ends, but the dread does not. Your mind keeps scanning for danger, your chest stays tight, and the worry jumps from topic to topic like it is looking for somewhere to land. When worry is intense, hard to control, shows up most days, and persists for months, clinicians stop calling it a season and start calling it an anxiety disorder, which simply means the alarm system is firing when there is no fire.

Depression is more than sadness, and this matters, because plenty of depressed people do not feel especially sad. The key signs are a low or empty mood most of the day, loss of interest or pleasure in things you used to enjoy (clinicians call this anhedonia, and we will spend all of Lesson 4 on it), changes in sleep and appetite, heavy fatigue, trouble concentrating, feelings of worthlessness or excessive guilt, and sometimes thoughts of death. When several of these hang around nearly every day for two weeks or more, that is the pattern doctors call depression. It is a whole-body condition, not a bad attitude.

Grief can look a lot like depression, but it moves differently. Grief usually comes in waves: you are ambushed by sorrow, then an hour later you laugh at a memory, then the wave hits again. In grief, your self-worth typically stays intact; you miss the person, but you do not usually conclude that you are worthless. Depression is more like fog than waves, flat and constant, and it tends to attack your sense of self. Grief and depression can also overlap, especially after a devastating loss. If grief has stopped moving and started swallowing you, that is worth bringing to a professional, not a sign you loved wrongly.

Consider Marcus, a 38-year-old ER nurse and the guy his church calls when anyone needs anything. For two years he told himself he was “just stressed.” But the exhaustion stopped responding to days off. He caught himself feeling nothing when patients cried, which scared him, because compassion used to be his whole personality. Then the numbness followed him home, and the things he loved, coaching his son’s team, worship on Sundays, went gray. Marcus was not dealing with one thing. He had burnout that had slid into depression, which is common, and naming both was the beginning of getting his life back.

Marcus’s story raises the obvious question: why bother sorting out which one you have? Because different problems need different medicine. Chronic stress often eases when the load genuinely changes and the body gets to recover. Burnout usually requires addressing the situation that is burning you, not just a vacation. Anxiety and depression respond well to specific, well-studied treatments like therapy and, for some people, medication. Calling everything “stress” is like calling every warning light on your dashboard “car trouble.” True, but not useful. Accurate names point to actual help.

A word to the Christian reader who is quietly wondering whether this whole conversation is spiritually suspect: naming what is happening in your body is not a failure of faith. Scripture never asks you to lie about your condition. The Psalms are full of precise, unflinching descriptions of misery: “my bones waste away,” “my tears have been my food day and night.” God is apparently not offended by honest diagnostics. Pretending you are fine is not faith; it is just pretending. You can trust God and tell the truth about your symptoms at the same time. In fact, that is usually how trust looks.

So when is it time to seek help? Here are reliable signals: your symptoms have lasted more than a couple of weeks and are not improving; they are interfering with work, relationships, or basic tasks like eating and showering; you are using alcohol or anything else to cope more than you want to admit; the people who love you have said they are worried; or you have had any thoughts that life is not worth living. Any one of these is reason enough to talk to your doctor or a licensed therapist. And if you ever have thoughts of harming yourself, please do not wait: in the U.S. you can call or text 988, the Suicide & Crisis Lifeline, any hour, any day.

One more reassurance before we practice. You do not need to arrive at a doctor’s office with a perfect self-diagnosis. That is their job, not yours. Your job is simply to describe what you are experiencing honestly: how you sleep, what has changed, what you can no longer feel or do. This lesson is not meant to turn you into your own clinician. It is meant to hand you a flashlight, so the thing in the dark has edges and a shape and, most importantly, a way out.