A torn Achilles tendon usually announces itself clearly: a sudden pop or snap at the back of your ankle, followed by sharp pain and an immediate difficulty walking. Most people describe the sensation as being kicked hard in the calf, even though nobody touched them. If that matches what you felt, there’s a strong chance the tendon is damaged, and the next few signs can help you gauge how serious it is before you get to a doctor.
The Telltale Signs of a Rupture
The most recognizable symptom is an audible pop or snap at the moment of injury. This doesn’t happen with every tear, but when it does, it’s hard to miss. Within seconds, you’ll feel a sharp pain concentrated in the back of your ankle and lower leg, and the area near your heel will start to swell.
What separates an Achilles tear from other calf injuries is what you can’t do afterward. Try these two things (gently):
- Push off the ground while walking. A torn Achilles makes it nearly impossible to push off with the injured foot. You’ll find yourself limping or unable to take a normal step.
- Rise onto your toes. Stand on just the injured leg and try a calf raise. With a full rupture, this simply won’t work. Your calf muscle has lost its connection to your heel bone.
You may also feel a gap or a soft indent in the tendon itself, a few inches above your heel bone. Swelling can obscure this, but if you run your fingers along the back of your ankle and feel a noticeable dip where the tendon should be taut, that’s a strong indicator of a complete tear.
Partial Tears Feel Different From Full Ruptures
Not every Achilles injury is all-or-nothing. Tears are graded on a scale: Grade 1 involves minimal fiber damage, Grade 2 means less than half the tendon fibers have torn, and Grade 3 is a full rupture where most or all fibers are severed.
With a partial tear, you’ll still feel that kicked-in-the-calf sensation and have pain, bruising, and swelling behind your ankle. The key difference is function. A partial tear often still lets you walk, though with pain and instability, especially on inclines or declines. You may be able to do a weak calf raise, which would be impossible with a complete rupture. The line between a bad partial tear and a full rupture can be blurry without imaging, so don’t assume you’re fine just because you can hobble around.
The Calf Squeeze Test
Doctors use a simple physical exam called the Thompson test to check for a rupture, and you can replicate a basic version at home with someone’s help. Lie face down on a bed or couch with your feet hanging off the edge. Have someone firmly squeeze the meaty part of your calf muscle. In a healthy leg, this squeeze will cause your foot to point downward automatically. If the foot doesn’t move at all, the Achilles tendon is likely fully torn.
It helps to test both legs for comparison. Your uninjured side will show a clear downward movement of the foot when squeezed, giving you a baseline for what normal looks like. This test is reliable for complete ruptures but won’t always catch partial tears, so a negative result doesn’t rule out damage entirely.
In a clinical setting, doctors combine the squeeze test with two other checks: observing the resting angle of your foot while you lie face down (a ruptured side will hang differently than the healthy side) and feeling along the tendon for a gap. When at least two of these three tests are positive, the diagnosis is confirmed in virtually all cases.
Injuries That Mimic an Achilles Tear
Several other calf injuries can feel alarmingly similar, which is why a proper diagnosis matters. A gastrocnemius strain (a tear in the large calf muscle itself) can also produce an audible pop and make calf raises painful or impossible. The tenderness, however, tends to be higher up in the calf rather than right above the heel. You may also feel a soft defect in the muscle belly rather than in the tendon.
A plantaris rupture is another mimic. The plantaris is a thin, almost vestigial muscle running alongside the Achilles. It can snap with an audible pop, but people with isolated plantaris injuries typically keep their full range of motion and don’t lose calf strength. The only way to definitively tell it apart from a gastrocnemius strain or Achilles tear is imaging.
Soleus strains feel different from the start. They tend to come on gradually over days or weeks rather than in a single dramatic moment. The pain sits deeper in the calf, more toward the outer side, and develops as a slow-building tightness rather than a sudden snap.
How Doctors Confirm the Diagnosis
If the physical exam points toward a tear, your doctor will typically order imaging. Both ultrasound and MRI are highly accurate for evaluating Achilles injuries, but they serve slightly different roles.
Ultrasound is fast, available in most clinics, and particularly good at distinguishing partial tears from full ruptures. Because it captures real-time images while your ankle moves, the technician can see exactly how the torn ends behave during motion and whether a gap remains when your foot is pointed downward. That information directly influences whether you’ll need surgery or can heal in a boot.
MRI provides a more comprehensive picture and is especially useful after surgery or when the clinical picture is unclear. It’s better at detecting subtle fluid collections and evaluating the surrounding tissue. Your doctor will choose one or the other based on what they need to see.
What to Do Right After the Injury
If you suspect a tear, stop putting weight on the leg immediately. Use crutches if available, or lean on someone to avoid loading the tendon further. Apply ice to the back of your ankle, keep the foot slightly pointed downward (not flexed up toward your shin, which stretches the torn ends apart), and get to a doctor as soon as possible.
Keeping the ankle still is important in the first few weeks regardless of whether you end up having surgery. Early treatment typically involves immobilization in a boot or cast with the foot angled downward, which brings the torn ends closer together and creates the best environment for healing.
Recovery Timeline
Whether you have surgery or heal in a boot, the recovery arc is long. With nonsurgical treatment, you’ll stay completely off the foot for about two weeks. Weight-bearing then increases gradually: roughly 25% of your body weight by week three, 50% by week four, 75% by week five, and full weight by week six.
Returning to normal activities that don’t involve sprinting, cutting, or jumping is realistic around six to nine months, provided you’ve regained about 80% of your calf strength. Full return to high-demand sports like basketball, soccer, or tennis typically takes a full year, and only after strength testing shows you’ve recovered completely. Surgical recovery follows a similar general timeline, though early protocols may differ slightly depending on the technique used.
The Achilles is the thickest tendon in your body, and it bears enormous forces during everyday movement. Healing it properly takes patience, and rushing the process significantly raises the risk of re-rupture.