Sore or Injured? How to Tell the Difference

This is probably the question I answer most often, and it is a good one. Getting it wrong in either direction causes problems: push through something that needed backing off, or stop training over something that was only ever muscle soreness.

What ordinary soreness tends to look like

Muscle soreness after unfamiliar or harder work usually shows up several hours to a day later, sits in the meat of the muscle rather than in a joint, affects both sides fairly evenly if you trained both sides, feels better once you warm up and move, and fades over a couple of days.

It is dull, diffuse and hard to point at with one finger.

What tends to deserve more attention

By contrast, be more curious about pain that came on suddenly, especially with a specific movement; pain you can point to precisely, particularly over a joint or tendon; pain that is sharp, burning, or electrical; pain that is clearly worse on one side only; swelling, a joint that gives way or locks, or pins and needles; and pain that worsens as you warm up rather than easing.

Duration matters too. Soreness that has not started improving after roughly a week is worth a conversation.

A simple way to test it

Warm up thoroughly and try the movement with much less load, half of what you would normally use, or bodyweight.

If it eases as you move and feels better by the end of the warm-up, you are probably dealing with soreness. If it stays the same or gets sharper, that is your answer. And if it hurts more the more you do, stop. That is not a threshold to break through.

Hurting and harming are not the same thing

This is where it gets nuanced, so I want to be careful. Pain is your nervous system's alarm, and alarms are not always calibrated to actual tissue damage. Persistent pain in particular can keep sounding long after tissue has healed, which is why "if it hurts, it must be damaging me" is not reliable as a rule, and why complete rest often makes long-standing pain worse rather than better.

At the same time, that idea gets misused to justify pushing through things nobody should push through. Both errors are common.

The honest answer is that telling them apart depends on your history, what you felt, when it started and how it behaves, which is precisely what an assessment is for.

A good rule while you are working it out: modify before you stop. Reduce range, load or speed rather than abandoning movement altogether.

Get seen promptly if

You heard or felt a pop with immediate swelling, you cannot put weight through the limb, a joint looks out of shape, you have numbness or weakness that is not resolving, or you have pain alongside fever or feeling generally unwell. Those are for a clinician now, not for a stretching routine.

Anything that has been grumbling for weeks and quietly shrinking what you are willing to do, that is worth bringing to an appointment. It is usually far more fixable than people expect.