In real life
A patient says, "My heart is racing." You can't see that feeling — they experience it and report it. That's a symptom. Then you check the pulse: 120 beats a minute. You can measure that. That's a sign.
| Symptom | Sign | |
|---|---|---|
| What it is | What the patient feels & reports | What the doctor observes |
| Example | "My heart is racing" | Pulse measured at 120 |
| Emotion version | Mood — "I feel sad" | Affect — a tearful face |
Why this is extra important in psychiatry
In many specialties, signs are easy to measure — a thermometer for fever, a cuff for blood pressure. But so much of the mind is private: "I feel empty," "I hear a voice," "my thoughts are racing." You can't point a machine at those. So psychiatry leans on three skills: listening, observing, and reasoning.
A picture for your mind 🎬
Imagine watching a film.
- What the camera sees — a person crying, pacing, speaking fast — those are like signs.
- What only the character knows — "I feel hopeless," "I'm terrified" — those are like symptoms.
A psychiatrist has to watch the screen and understand the character.
The ladder: from a word to a diagnosis 🪜
Never jump straight from one symptom to a diagnosis. Climb the ladder:
- Symptom — one experience ("I can't sleep").
- Syndrome — a cluster of symptoms that hang together (low mood + no interest + poor sleep + low energy…).
- Diagnosis — a defined condition, decided only after weighing the whole story.
So if a patient says "I hear voices," we don't write "schizophrenia." That one symptom simply tells us where to investigate — it doesn't end the investigation.
A special pair: Mood vs Affect
This one returns again and again, so meet it gently now:
- Mood = the weather the patient reports inside themselves ("I feel sad").
- Affect = the emotion the doctor sees on the outside (tearful face, or a flat expression).
Memory hook: Mood = what they Say. Affect = what you See.
Words doctors use
- Phenomenology — a scary‑sounding word for a simple habit: carefully describing what the experience is actually like, before slapping a label on it.
- Objective vs subjective — objective = observed/measured (signs); subjective = personally felt (symptoms).
Quick check ✅
- "I feel hopeless." Symptom or sign?
- The doctor notes the patient is tearful with little expression. Symptom or sign?
- Finish the ladder: Experience → ______ → Syndrome → ______.
Remember this 🌟
Where we're going next → How do doctors capture all of this in one organised look at the mind? Meet the Mental State Examination — Concept 4.