A torn Achilles tendon usually announces itself with sudden, sharp pain at the back of your ankle, often accompanied by an audible pop or snap. Many people describe the sensation as being kicked or struck from behind, only to turn around and find no one there. The pain may actually ease within minutes, which tricks some people into thinking the injury isn’t serious. But difficulty walking, pushing off your foot, or rising onto your toes signals that something significant has happened.
What a Torn Achilles Feels Like
The moment of rupture is distinctive. You’ll typically feel a sudden, sharp pain in the lower back of your leg, roughly two to six inches above your heel bone. About 75% of ruptures happen in this specific zone because it receives the least blood supply of anywhere along the tendon, making it the weakest link.
Along with the pain, you may hear or feel a pop or snapping sensation. Swelling sets in quickly, and bruising often follows within hours. One of the most telling signs is an immediate loss of push-off strength. Walking feels awkward, going up stairs becomes difficult, and standing on your toes on the injured side feels impossible. Some people can still walk with a flat-footed gait, which is why partial and even full tears sometimes get mistaken for a bad sprain.
How a Tear Differs From Tendonitis
If your Achilles has been sore for days or weeks, getting gradually worse, that pattern points more toward tendonitis than a tear. Tendonitis builds slowly. The tendon feels stiff in the morning, loosens up with gentle movement, then aches again after heavier activity. You can usually still rise onto your toes, though it hurts. The area along the tendon may feel thick or swollen to the touch, and pressing on it produces tenderness.
A tear is a different story. It happens in a single moment, usually during a sprint, a jump, or a sudden push-off. The onset is abrupt, not gradual. Where tendonitis causes pain that fluctuates with activity level, a tear creates immediate weakness. The clearest functional difference: with tendonitis you can still do a calf raise (even if it’s painful), while with a significant tear you simply cannot generate the strength to get your heel off the ground on that side.
Two Tests You Can Try at Home
No home test replaces a proper exam, but two simple checks can give you a strong clue about whether you’re dealing with a tear.
The squeeze test: 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. On a healthy leg, this squeeze will cause your foot to point downward slightly. If squeezing produces no foot movement at all, your Achilles is likely torn. This is actually the same test doctors use in their offices (called the Thompson test), and it correctly identifies ruptures about 96% of the time.
The tiptoe test: Try standing on just the injured leg and rising onto your toes. If you can’t lift your heel off the ground at all, or you have dramatic weakness compared to the other side, a significant tear is likely. Even after surgical repair, patients often struggle with a decline heel raise (pushing up on toes while standing on a downward slope), so complete inability to do a flat-ground heel raise right after injury is a strong indicator.
What a Doctor Looks For
Orthopedic guidelines recommend finding at least two physical signs before diagnosing a rupture. The squeeze test is the most reliable, but doctors also feel along the tendon for a gap. When the Achilles tears completely, you can often feel an indentation or soft spot a few inches above the heel where the tendon should be taut. This gap test correctly identifies tears about 73% of the time.
Another clinical sign involves bending your knee to 90 degrees while lying face down. On the healthy side, your foot will naturally hang in a slightly pointed-down position because the intact tendon holds tension. On the torn side, the foot drops into a flat or even toes-up position because there’s no tension keeping it pointed.
Partial Tears vs. Complete Ruptures
Not every Achilles tear is all-or-nothing. A partial tear damages some fibers while leaving others intact. You’ll still have some push-off strength, and the squeeze test might produce a small amount of foot movement, making the diagnosis trickier. Pain and swelling are present, but the dramatic “kicked from behind” sensation may be less pronounced. You might be able to walk with a limp rather than barely being able to bear weight.
A complete rupture severs all connection between your calf muscles and your heel bone. The functional loss is obvious: no ability to stand on tiptoes, no push-off when walking, and a visible or palpable gap in the tendon. If there’s any doubt about whether a tear is partial or complete, MRI provides the most accurate picture. It correctly characterizes Achilles injuries up to 95% of the time and helps determine whether the tear needs surgery or can heal with immobilization.
Who Is Most at Risk
Achilles ruptures most commonly hit “weekend warriors,” people between 30 and 50 who play sports intermittently rather than training consistently. The tendon gradually loses elasticity with age, and sporadic intense activity (a pickup basketball game, a sprint for a bus) can exceed what a deconditioned tendon can handle.
Certain medications raise your risk significantly. A class of antibiotics called fluoroquinolones (commonly prescribed for urinary tract and respiratory infections) triples the risk of Achilles rupture. If you’ve taken these antibiotics alongside a corticosteroid like prednisone, the risk jumps nearly 20-fold. This elevated risk persists for about 60 days after you stop taking the medication, and it’s highest in people over 60.
Other risk factors include previous Achilles tendonitis, sudden increases in training intensity, tight calf muscles, and regularly playing sports that involve explosive movements like tennis, basketball, or soccer.
What Happens if You Ignore It
Because the initial sharp pain often fades, some people assume they’ve just tweaked something and try to walk it off. This is a mistake with a complete tear. Without treatment, the torn ends of the tendon retract and scar tissue fills the gap, leaving you with a permanently weak push-off. Walking on flat ground may eventually feel manageable, but running, jumping, and climbing stairs will remain difficult.
Partial tears can worsen into complete ruptures if you keep loading the tendon. If you felt a pop, can’t rise onto your toes, or feel a gap in the tendon, get it evaluated within a day or two. Earlier diagnosis gives you more treatment options, whether that’s surgery or structured immobilization in a boot, and leads to better long-term function.