How to tell the difference between discomfort and harm

Not all discomfort is a warning sign

Running involves sensation.

• Breathlessness

• Warm muscles

• A feeling of effort

For many runners — especially those starting, returning, or rebuilding confidence — it can be hard to know what’s normal and what isn’t.

Understanding the difference between discomfort and harm removes a lot of unnecessary fear.

Discomfort that’s usually OK

Some sensations are a natural part of running and adaptation.

Common, expected discomfort includes:

• Heavier breathing that settles when you slow down

• Muscular fatigue during or after a run

• Mild stiffness that eases as you warm up

• General tiredness that improves with rest

These are signs your body is responding to training.

They can feel uncomfortable — but they aren’t dangerous.

When discomfort becomes a signal

Harm tends to feel different.

It’s often:

• More specific

• More persistent

• Harder to ignore

Learning to tell the difference isn’t about being overly cautious.

It’s about being informed.

A simple way to think about this is with a traffic-light approach.

A simple traffic-light guide to running sensations

🟢 Green — OK to continue

These sensations are usually part of normal running:

• Steady breathlessness that settles when you slow down

• General muscle fatigue or heaviness

• Warmth in the muscles

• Mild stiffness that eases as you warm up

What to do:
Carry on. Stay relaxed. Keep effort manageable.

🟠 Amber — proceed with care

These sensations suggest your body may need adjustment:

• Tightness that feels unusual or one-sided

• Discomfort that increases rather than settles

• Fatigue that feels deeper than expected

• Niggles you notice more as the run continues

What to do:
Slow down. Shorten the run. Stop if needed.

Make a note of how it feels later and the next day.

🔴 Red — stop and reassess

These sensations usually need attention:

• Sharp or localised pain

• Pain that alters how you move

• Pain that worsens as you continue

• Pain that doesn’t improve with rest

What to do:
Stop running and allow recovery.

If pain persists, seek appropriate professional advice.

Why this can feel confusing

Many runners are taught to “push through discomfort” — without being shown how to tell which discomfort matters.

That can lead to:

• Ignoring early warning signs

• Fear around normal sensations

• Loss of confidence after a setback

Learning the difference isn’t instinctive.

It’s a skill.

Learning your body’s language

Body awareness develops through:

• Experience

• Reflection

• Paying attention without judgement

Confidence grows when you understand how your body responds to effort, stress, rest, and recovery.

That knowledge makes running feel safer — and more sustainable.

A kinder way to respond

Listening to your body doesn’t mean stopping at the first sign of discomfort.

It means responding thoughtfully.

Sometimes that looks like easing off.

Sometimes it looks like stopping.

Sometimes it looks like continuing calmly — because you recognise the feeling.

Listening isn’t weakness.

It’s awareness.

— Tim