Achilles tendon pain is usually felt behind the heel or a little above it. It often starts as morning stiffness, soreness after a run, or pain that gets worse on hills and with quick pushes. Most often the tendon has simply had more load than it has adapted to handle.
The tendon heals more slowly than many muscle strains. That is why the best approach is usually not total rest and not pushing through pain, but adjusting load in a calm, gradual way. If you feel a sudden snap, cannot rise onto your toes, or walking becomes clearly difficult, a tear needs quick assessment.
What Achilles tendon pain feels like#
Pain can sit in the middle of the tendon a few centimetres above the heel or right at the attachment point at the back of the heel bone. Early on it may feel stiff and ease once you get moving. Later it can stay painful during a run and also bother you at rest.
The tendon may feel tender when pressed and thicker than on the other side. If the back of the shoe rubs the sore spot, the pain can get worse with every step.
Why the tendon becomes painful#
The usual reason is a change in load. More running, hill repeats, jumping, a new sport, hard ground or too little recovery can all load the tendon more than it can tolerate. Calf strength, ankle mobility and shoe fit also matter.
The tendon needs load to become stronger, but too much load irritates it. That is why complete rest may help for a short time, yet the problem often returns if the tendon never adapts gradually to daily life and exercise again.
What to do early on#
The first step is to reduce load. Pause hill running, jumps and fast intervals. Replace some exercise with cycling, swimming or walking if those do not make the pain worse. The goal for daily life is that the pain does not keep increasing from one day to the next.
Cold can calm an irritated area for a short time. A small heel lift in the shoe may reduce tendon stretch for some people in the acute phase. Strong stretching through pain is usually not wise, especially if the pain is at the tendon attachment.
Returning to training#
Once the worst pain settles, the tendon needs gradual strengthening work. Calm calf strengthening is often useful, but the amount and pace should match the symptoms. A little discomfort after exercise can be normal, but a clear worsening the next morning usually means the load was too high.
Return to running with short, easy sessions on flat ground first. Hills, intervals and jumping should come later. If you need a broader view of running-related issues, start with a running injuries guide that fits your situation.
Pain under the heel or behind it#
A sharp first-step pain under the heel in the morning often points more toward the plantar fascia. Achilles tendon pain is usually felt behind the heel or above it. The difference helps with self-care choices.
If the pain is clearly under the heel, the problem is more likely in the sole of the foot. If it is behind the heel and hurts more when rising onto your toes, the Achilles tendon is the more likely focus.
When to suspect a tear#
A torn Achilles tendon can feel like a sudden snap, a kick, or severe pain in the calf and heel area. After that, walking becomes harder and rising onto the toes may be impossible. In that situation, do not wait and watch at home.
A partial tear or another more serious problem can also cause a clear loss of function. If you cannot bear weight normally or the pain started suddenly during a strong push, assessment is needed. Swelling, bruising or obvious weakness also suggest this is more than ordinary training soreness.
When to contact healthcare services in Finland#
Contact healthcare services quickly if you suspect an Achilles tendon tear, cannot rise onto your toes, walking is clearly difficult, or the pain started with a sudden snap. Assessment is also appropriate if the pain continues for several weeks despite self-care, the tendon swells clearly, or the symptom returns every time you increase activity.
If you have diabetes, an inflammatory joint disease or a medicine that can affect tendons, the pain deserves a lower threshold for review.
Further reading and sources#
Further reading: