Calf strain symptoms vary depending on the severity of the injury. Recognising the signs early can help you identify how serious your injury is and when to seek treatment.
This page explains the symptoms of a calf strain, how injuries are graded, and the tests used to diagnose a torn calf muscle.
Calf strains are classified into three grades based on the extent of muscle damage.
Mild Grade 1 injuries
A Grade 1calf strain is a minor tear of the muscle with less than 25% of the muscle fibres affected.
Symptoms consist of:
- A twinge in the back of the lower leg, or simply a feeling of tightness.
- You may be able to carry on playing or competing with minimal pain.
- However, more tension or aching in the calf muscle is likely to occur. This may take up to 24 hours to develop.
Grade 1 strains easily turn into grade 2 strains if not treated properly.
Moderate Grade 2 injuries
Grade 2 calf strains are more severe, with between 25% and 90% of the muscle fibres torn.
Symptoms include:
- Sudden sharp pain at the back of the lower leg, with swelling likely.
- Bruising may develop over the following couple of days.
- Pushing up onto your toes is painful.
- Significant muscle weakness.
Severe Grade 3 injuries
Grade 3 injuries are the most severe and involve 90 to 100% of the muscle fibres. Another name for a complete tear is a rupture.
Symptoms include:
- Severe and immediate pain in the back of the lower leg.
- A ‘pop’ sensation at the time of injury.
- You will be unable to walk or will walk with a significant limp.
- Swelling develops rapidly within an hour or so and bruising is also likely to be visible.
- This is a result of the torn muscle fibres and associated blood vessels.
- A gap or deformity in the muscle may be visible as the torn fibres bunch up towards the knee.
Seek professional assessment if you experience severe pain, significant swelling, difficulty walking, or suspect a more serious tear. Early diagnosis helps guide the right treatment and reduces the risk of long-term problems.
Calf tear tests
A physiotherapist or doctor may perform specific tests to help diagnose a calf strain.
Active ankle mobility
You may be asked to move your up and down by yourself without any resistance. This stretches your calf muscle when you pull your foot up (dorsiflexion) and contracts it when you point your foot down (plantar flexion).
If you have calf pain doing this, then it may indicate a calf strain, probably a severe one.
Resisted plantar flexion
This involves trying to point your foot downwards against resistance. This may be from your therapist resisting the movement with their hands. Or if you have a particularly mild calf strain, then you may need to perform a single-leg calf raise whilst standing to reproduce painful symptoms.
More on Calf strains
- Calf strain treatment & rehab – full recovery guide
- Calf Massage techniques – how to apply sports massage
- Calf strain rehabilitation program – full Calf strain rehabilitation program
