It’s the morning after a hard session, and your legs, shoulders or back let you know about it. Then a quiet question shows up: am I just sore, or am I injured?
In my clinic, I see people get the answer wrong in two directions. Some carry on as if nothing happened. They work around the pain, finish the session, and take that as proof they’re fine. But being able to finish a session doesn’t mean the tissue was ready for the load. Others stop at the first ache and lose days of training to soreness that often eases faster with gentle movement.
I don’t believe in pushing through pain. I don’t believe in “it hurts, so don’t move” either. What helps is learning to tell the two apart, and knowing what to do with each.
What normal soreness feels like
Soreness after training usually builds slowly. It often shows up the day after, especially after something your body wasn’t used to: a new exercise, a heavier week, the first session back after a break. Athletes call it DOMS, or delayed onset muscle soreness, and it’s simply your body reacting to a load it hasn’t met before.
It feels dull and spread out, across the whole muscle rather than one spot. Often it’s on both sides, in the muscles that did the work. It’s stiff at first, loosens as you warm up, and gets better from one day to the next.
When it’s something more
An injury tends to announce itself differently. There’s often a clear moment, during a sprint, a jump, a change of direction or a heavy lift, when something felt sharp or wrong. The pain sits in one place you can point to, usually on one side. There may be swelling, bruising or a drop in strength, and you start moving differently without meaning to.
Some injuries are quieter. A sore tendon, like the Achilles or the one just below the kneecap, can ache at the start of training and fade once you’re warm, which is exactly why people keep going. Then it comes back, week after week. Pain that keeps returning to the same spot is worth a closer look.
Not every ache in the hamstring, calf, knee or groin is an injury. Where it is, how it started and what it does to your movement usually tell the story together.
Three questions instead of counting days
People often ask me how many days they should wait. I don’t work in days, and how much it hurts is only part of the picture. I want to know when it started, what makes it worse, and how your body is working right now.
The answers usually point to one of three paths. If the pain is mild, eases with gentle movement and doesn’t change how you move, light and adjusted activity is usually fine. If it’s building, changing the way you move, or limiting your strength or range, it’s time to reduce the load or stop. And if it’s sharp, sudden or significant, especially with swelling or a loss of function, it needs a proper look, not an attempt to stretch or massage it out.
If it isn’t easing day by day, or it’s getting worse, that tells you more than any number on a calendar.
It started like a tight calf
A padel player came to me after a match with what he called a tight calf. As we talked, it turned out he had felt a sharp, stabbing pain during the game and couldn’t carry on playing.
The sudden pain and the instant loss of function didn’t fit a tight muscle. This wasn’t something to massage out. I sent him to a doctor, and the scan the doctor ordered showed a significant tear in the inner calf muscle.
From there, we matched the load to each stage of healing. With hands-on treatment, taping, mobility work and gentle, progressive exercise, he started to feel good again, even walking normally. That’s when it’s easiest to forget the tissue is still healing. A few minutes playing with his child at home, and he felt a sharp sting in the same spot. I told him to stop all activity straight away, even play like that. The area had most likely flared up again, and it cost him another month of rehab.
He came back step by step and returned to padel. Feeling better can be misleading, and a setback can make the road much longer.
What to do with each
When it really is soreness, keep moving gently, sleep well, and hold off on new intensity until your body has caught up. Massage is one of the better-supported ways to ease soreness, and for heavy, tired legs, a session in the Recovery Boots can help them feel lighter between training days.
When it might be an injury, back off whatever makes it hurt, don’t push through sharp pain, and get it looked at, so you know what you’re dealing with before you load it again.
The boots wait, too. I don’t rush them in the first days after a possible significant strain, with sharp pain or real swelling, or when something is getting worse for no clear reason. A painful, swollen calf on one side should be seen by a doctor first, since it can be a sign of a blood clot. Recovery is part of the plan. It just can’t replace understanding the problem.
When a doctor should see it first
Most aches after training are exactly what they seem. But a few signs mean a doctor should see it before anyone else does:
- A pop or snap with a sudden loss of strength, or you can’t put weight on it
- Fast swelling, a visible change in shape, or pain right on a bone that keeps getting worse
- Numbness, tingling or new weakness
- One calf that’s painful, swollen, warm or red
- Leg pain together with chest pain or sudden shortness of breath, which needs emergency care right away
Fever, or a painful area that turns red and hot, is also a reason to see a doctor. Sending someone to a doctor is part of my work, not the end of it.
Quick answers
How long does normal muscle soreness last?
It usually shows up a day or so after training and eases over the next few days. Watch the trend rather than the calendar: a little better each day is a good sign.
Should I train when I’m sore?
Usually, yes, as long as it’s normal soreness. Light, easy movement often helps it ease. Save the hardest sessions and anything new for when the soreness has settled.
Should I see a doctor or a sports therapist first?
If you notice any of the warning signs above, see a doctor first. If not, a sports therapist can take a proper look, and if it needs a doctor, I’ll tell you.
Listening, not winning
I know athletes want to come back fast. But being professional also means knowing when to stop and find out what’s going on. The goal isn’t only to stop hurting. It’s to keep training, healthy, for years.
Your body isn’t an opponent you need to beat. It’s a system to understand, to train and to respect.
If you’re not sure which side of the line you’re on, come in and we’ll work it out together.
Kfir Zilber is a sports therapist based in Thessaloniki, Greece,
specializing in sports injury rehabilitation and recovery.
Works with athletes, active people and sports teams.
Disclaimer: This article is for general information only and is not a substitute for medical advice, diagnosis or treatment. Please consult a doctor about any injury or medical concern.