Ankle & foot
Calf Strain (Gastrocnemius / Soleus)
A torn or overstretched calf muscle — a sudden pull mid-calf ('tennis leg') or a gradual deep ache in runners. Managed with graded strengthening and physio.
Common symptoms
- Sudden sharp pain in the middle of the calf during sport, sometimes like being hit or kicked
- A gradual tightening ache low and deep in the calf during running
- Pain when walking, rising onto tiptoe or pushing off
- Tenderness in the calf muscle, sometimes with swelling or bruising
- Calf feels tight and weak
- Difficulty walking up stairs or hills
Overview
The calf is made up of two main muscles: the gastrocnemius, the larger muscle you can see at the back of the lower leg, and the soleus, which lies deeper underneath it. Both join the Achilles tendon above the heel. A calf strain is a tear of some of the muscle fibres, ranging from a mild overstretch to a larger partial tear.
There are two typical stories. A gastrocnemius strain usually happens suddenly — a sharp pain in the middle of the calf when lunging, pushing off or changing direction, often described as feeling like being hit by a stone or kicked in the calf. It is so common in racket sports in people over 35 that it is nicknamed "tennis leg". A soleus strain tends to build more gradually, especially in distance runners: a tightening ache lower and deeper in the calf that gets worse during a run until you have to stop.
A calf strain is different from an Achilles problem, which affects the tendon lower down near the heel. Mild strains often settle over a few weeks, while larger tears take longer, and recovery times vary from person to person. A gradual, well-guided return to running and sport aims to reduce the chance of the strain coming back.
Causes and risk factors
- Sudden explosive movements — lunging, sprinting, jumping or pushing off in racket sports
- A rapid increase in running distance, speed or hill work
- Calf muscles that lack strength or endurance for the demands placed on them
- Age over 35, as muscles and tendons become less tolerant of sudden load
- A previous calf strain that was not fully rehabilitated
- Fatigue, a rushed warm-up or returning to sport after a break
- A change of footwear, such as switching to low-heel running shoes
How we may be able to help
Assessment first. We find out how the injury happened, locate which part of the calf is involved and grade the strain, test calf strength and endurance, and check that the symptoms are not coming from the Achilles tendon, a nerve or a blood clot. If anything suggests a more serious injury or a clot, we will direct you to the right urgent care. If imaging would help — for example with a larger tear in a competitive athlete — we can arrange an online private GP consultation.
Physiotherapy is the core of recovery. In the early days the aim is to protect the muscle while keeping you moving with comfortable walking and gentle ankle movement. We then build a graded strengthening programme — calf raises with the knee straight and bent to target both muscles, progressing to hopping and running drills — so the calf is ready for the demands of your sport. Interferential therapy may be used for short-term pain relief in the early stage, and kinesiology taping can provide support and comfort as you return to walking and training.
As the strain settles, soft-tissue techniques such as IASTM, and dry needling for tight, sensitive areas of the calf in the later stage, may help ease stiffness and support your return to running. We also look at your training load, footwear and warm-up so you can return to sport with more confidence.
What you can do at home
- In the first 48–72 hours, protect the calf: avoid running and hard stretching, and use a wrapped ice pack for 10–15 minutes at a time
- Keep walking within comfort; a small heel raise in your shoe may ease pain in the first few days
- Start gentle ankle movements and comfortable calf raises as soon as they are comfortable
- Build up strength gradually, with the knee straight and bent, before you return to running
- Restart running with short, easy runs on flat ground and increase gradually
- Warm up properly before sport, especially if you are over 35 or returning after a break
Frequently asked questions
How is a calf strain different from an Achilles injury?
A calf strain affects the muscle, usually in the middle or lower half of the calf. Achilles problems affect the tendon lower down, between the calf and the heel. A sudden Achilles rupture often feels like being kicked at the back of the heel and makes it very hard to push off — that needs urgent assessment at A&E. We check both carefully at your assessment.
How long before I can run again?
It depends on the size and location of the strain and on your sport. Mild strains often allow a return to running within a few weeks, while larger tears take longer. Rather than going by time alone, we use strength and hopping tests to guide when you are ready. Outcomes vary from person to person.
Do I need a scan?
Usually not. The history and examination are normally enough to grade the strain. Imaging may be considered for a larger tear, for competitive athletes or when recovery is slower than expected, and we can arrange an online private GP consultation if needed.
Should I stretch my calf?
Not hard in the first few days, as this can strain the recovering fibres. Gentle movement within comfort is fine. As the calf settles, progressive strengthening matters more than stretching for reducing the chance of the strain coming back.
This page is general information, not a diagnosis. A clinician will assess you before recommending any treatment. Outcomes vary from person to person. Written with reference to NHS and other peer-reviewed guidance.