Most people should avoid running for up to eight weeks after a hamstring strain, then return in stages rather than all at once. The date on the calendar matters less than whether the leg can take each step without pain. Milder strains come back faster, but rushing the return is a common reason a hamstring tears again.
This is a guide to what those stages look like, how to know you are ready to move from one to the next, and when the injury needs a proper assessment rather than patience.
The short version
- A hamstring strain is a tear in one of three muscles behind the thigh.
- For the first two to three days, use PRICE: protect, rest, ice, compress, elevate.
- Avoid running for up to eight weeks; return in stages, not on a fixed date.
- Progress a stage only when it stays pain-free; pain means drop back one.
- Call 111 if walking is very painful or the leg is hard to move.
What a hamstring strain actually is
The hamstrings are three muscles that run down the back of the thigh, from the base of the pelvis to just below the knee. They slow the leg down at the end of each stride, which is exactly when a sprint or a fast stretch can overload them. A strain is a tear in the muscle fibres, ranging from a handful of fibres to a more complete tear.
Severity is usually described in grades. A grade one is a minor tear with little loss of strength. A grade two is a partial tear with more pain and weakness. A grade three is a severe or complete tear, often with sudden sharp pain and difficulty walking. The NHS notes that mild hamstring injuries usually get better in a few days, while severe ones can take weeks or months to heal.
Grades are a rough guide, not a stopwatch. Two people with the same grade can recover at different speeds, which is why we manage the return by what the leg can do, not by a number on a chart.
The first 72 hours
For the first two to three days after the injury, the aim is to settle the swelling and protect the tear. The NHS recommends PRICE: protect the leg, rest it, ice it for up to 20 minutes every two to three hours, use a compression bandage, and elevate it where you can. It also advises avoiding heat, massage and alcohol in the first couple of days, as these can increase swelling.
Complete rest is not the goal beyond those first few days. Gentle, pain-free movement keeps the muscle from stiffening and starts to guide the new tissue to lay down along the line of load. The skill is in the dose: enough to keep things moving, not so much that you pull on the healing tear.
The stages of getting back to running
A sensible return runs through a series of stages. You do not move up until the current stage is comfortable and pain-free.
- Stage 1, walking. Pain-free walking at a normal pace, then a brisk pace, with no limp. If you are still guarding the leg, you are not ready to load it harder.
- Stage 2, strength. Building the hamstring back up with progressive exercises, starting light and gradually adding load. This is the stage people skip, and it is the one that holds up against re-injury.
- Stage 3, jogging intervals. Short, easy jogging mixed with walking, on the flat, at a pace where you could hold a conversation. No sprinting, no hills.
- Stage 4, continuous running. Steady continuous running, building distance before pace. Time on your feet comes back before speed does.
- Stage 5, speed and sport. Strides, faster running and sport-specific drills. Sprinting loads the hamstring the hardest, so it is the last thing to return, not the first.
The NHS advice to build fitness up gradually, warm up first, and stop if you feel pain runs right through all of these stages.
How to know you are ready for the next stage
The rule we use in clinic is simple: a stage has to be pain-free during the activity, straight after, and the next morning before you move up. Pain during the activity is a clear stop. Pain that only shows up the next day means you did too much, and the answer is to drop back a stage rather than push on.
Strength matters more than how the leg feels on a good day. If the injured side is clearly weaker than the other when you load it, the tissue is not ready for sprinting, however fine it feels walking around. This is why the strength stage is not optional. The NHS makes the same point: a physiotherapist or osteopath can show you specific exercises that both speed up recovery and reduce the chance of injuring the hamstring again.
When to see someone
Most hamstring strains settle with sensible self-care and a staged return. Some need looking at sooner. The NHS advises contacting 111 if it is very painful or the pain is getting worse, if there is a large amount of swelling or bruising, if it hurts to walk or stand on the injured leg, if the leg feels very stiff or is hard to move, or if it is not improving with self-care.
Get urgent help if you felt a sudden sharp tear at the back of the thigh followed by a loss of power, if you cannot bear weight at all, or if you have numbness, pins and needles, or weakness spreading down the leg, which point to the nerve rather than the muscle. A high temperature with a hot, red, swollen leg also needs same-day attention.
An assessment is also worth it when a hamstring keeps coming back. A strain that returns every season usually means a step was skipped, often strength or sprint preparation, or that something further up the chain, at the hip or lower back, is loading the hamstring unfairly.
Where we come in
At the clinic we assess the injured hamstring, the strength gap between the two legs, and how your hip and lower back are sharing the load, then build the staged return around what we find. Hands-on treatment helps settle pain and restore movement, but the part that keeps you running is the progressive strength and running plan that sits alongside it. For more on how we handle running and sports injuries, see our sports injury clinic page.
If this sounds like what you are dealing with, an assessment is the next step. Book at hardimanperformance.com/book-online.