Achilles tendonitis causes symptoms and treatment options

If you feel pain in your heel or behind your calf, especially after running or exercising, the cause could be Achilles tendonitis. This is the large tendon that connects your calf muscles to your heel bone. This inflammation is not only painful, but it can also affect your ability to walk, run, or even perform your regular daily activities.In this Delly Medical article, we will explore the causes of Achilles tendonitis, its symptoms, types, diagnostic methods, and the latest treatment options including medications, exercises, and surgery. We will also provide important tips to prevent complications and speed up recovery.

What is Achilles Tendonitis?

Achilles tendonitis is an injury that occurs due to repeated stress and strain on the tendon connecting the calf muscles to the heel bone. This injury can cause:

Pain in the heel or behind the calf, especially after movement or exercise.
Stiffness in the heel, often most noticeable when waking up in the morning.

Treatment usually involves rest, ice packs, stretching and strengthening exercises, and recovery can range from a few weeks to several months depending on the severity of the inflammation.

Is Achilles Tendonitis Dangerous?

Most of the time, it is not dangerous, but if left untreated, it can cause chronic pain or weakness in the leg.
Early treatment is important to prevent tendon rupture or long-term complications.

What Increases the Risk of Achilles Tendonitis?

Running or jumping frequently without proper warm-up.
Old or unsupportive footwear.
Weak calf muscles or flat feet.

Can I Continue Exercising During Tendonitis?

It is recommended to reduce activities that put stress on the tendon.
Low-impact exercises such as swimming or stationary cycling may be possible after consulting a doctor.

Typical Recovery Time

Mild cases: Improvement is usually seen within a few weeks up to a month with rest and exercises.
Chronic cases or partial tears: May take several months of therapy and physiotherapy to return to normal activity.

Does the Pain Disappear Completely?

Most people experience significant improvement with rest, exercises, and medications.
Chronic tendonitis may require long-term monitoring and ongoing exercises to maintain tendon flexibility and strength.

Types of Achilles Tendonitis

Achilles tendonitis can vary depending on the location and severity of the inflammation:

Chronic Achilles Tendonitis
- Caused by continuous stress on the tendon over a long period.
- Pain develops gradually and increases with physical activity.
- Often accompanied by morning stiffness and difficulty moving after rest.
Acute Achilles Tendonitis
- Appears suddenly after intense activity or excessive strain.
- Pain is sudden and severe, sometimes with swelling or redness.
Insertional Achilles Tendonitis
- Inflammation occurs at the point where the tendon attaches to the heel bone.
- More common in older adults or athletes who put heavy stress on the heel.
Non-Insertional Achilles Tendonitis
- Inflammation occurs in the middle portion of the tendon, away from the bone.
- More common in younger people or athletes who run or jump frequently.
Tendinosis / Partial Tear
- Chronic inflammation can cause a partial tear or degeneration of tendon fibers.
- Weakens the tendon and increases the risk of injury if activity continues without treatment.

Stages of Achilles Tendonitis

Achilles tendonitis usually develops gradually. It can be classified based on symptom severity and tendon impact:

Early Stage
- Mild pain after exercise or long walks.
- No visible swelling or redness.
- Pain usually improves with rest.
Moderate Stage
- Pain occurs during daily activities.
- Mild swelling or warmth may appear on the tendon.
- Morning stiffness after rest.
Severe Stage
- Severe and persistent pain, even at rest.
- Visible swelling or redness, sometimes thickening of the tendon.
- Weak calf muscles, difficulty walking or climbing stairs.
- Risk of partial tendon tear with intense activity or falling.
Chronic Stage
- Persistent pain for long periods; the tendon may be stiff or degenerated.
- Limited movement; sports activities are difficult or impossible without pain.
- Often requires longer treatment, sometimes medical or specialized physical therapy to restore tendon strength and mobility.

Causes of Achilles Tendonitis

The tendon connecting the calf muscles to the heel can become inflamed due to overuse or excessive stress. Main causes include:

Excessive Physical Activity
- Running long distances or sports involving repetitive running and jumping.
- Sudden increase in exercise intensity without gradual warm-up.
Weak or Tight Calf Muscles
- Weak calf muscles or insufficient tendon length increase pressure on the tendon, making it more prone to inflammation.
Inappropriate Footwear
- Thin or old shoes that do not support the heel.
- High heels or lack of heel support increase stress on the tendon.
Foot or Movement Problems
- Flat feet or abnormal walking patterns increase tendon load.
- Walking on hard surfaces for long periods increases strain.
Age and Health Condition
- Older adults have less flexible tendons, increasing the risk of inflammation.
- Conditions such as diabetes or obesity increase the likelihood of injury.
Previous Injuries
- Previous fractures or tendon strains may weaken the tendon and make it more susceptible to inflammation.

Symptoms of Achilles Tendonitis

Pain behind the heel
Clear pain or tenderness when touching the back of the heel or along the tendon.
Pain worsens with running or climbing stairs.
Swelling or redness
Mild swelling around the tendon may appear, sometimes with redness or warmth on the skin.
Stiffness and limited movement
Stiffness in the tendon, especially in the morning or after long periods of rest.
Difficulty moving the foot or bending it upwards.
Popping or cracking sounds
Some patients notice a slight popping sound when moving the foot or during activity.
Weakness or fatigue in the leg
Feeling of weak calf muscles or fatigue faster than usual during long walks or running.
Worsening symptoms with activity
Pain increases with movement or loading the tendon.
Pain may decrease with rest but returns with activity.

Diagnosis of Achilles Tendonitis

Medical history and physical examination
- Doctor asks about pain onset, duration, and intensity.
- Activities or sports causing strain.
- Any previous injuries in the leg or heel.
- Physical exam:
  - Pressing the back of the heel to detect pain or swelling.
  - Testing tendon flexibility and foot/heel movement.
Imaging tests
- X-ray: Evaluates the bone and rules out fractures or bone spurs.
- Ultrasound: Assesses tendon condition, inflammation, or partial tears.
- MRI: For chronic or complex cases to determine inflammation or degeneration.
Differential diagnosis
Distinguishing Achilles tendonitis from other causes of heel pain such as:
- Heel bursitis
- Calf muscle tears or injuries
- Joint or bone problems around the heel

Complications of Untreated Achilles Tendonitis

Persistent pain
Pain may continue even at rest, not just during activity.
Affects walking, stair climbing, or prolonged standing.
Swelling and stiffness
Chronic inflammation may cause tendon thickening or stiffness.
Reduces tendon flexibility and limits foot/heel movement.
Weak muscles and leg performance
Damaged tendon cannot transmit force efficiently, weakening calf muscles.
Daily activities like walking or running become difficult and tiring.
Risk of partial or complete tendon tear
Continued stress may lead to tendon rupture, requiring urgent medical attention.
Impact on sports and daily life
Difficulty performing activities involving running or jumping.
May affect work or daily tasks requiring leg effort.
Chronic complications
Long-term inflammation can lead to tendon degeneration and loss of flexibility.
Treatment may be longer and sometimes requires specialized physical therapy or surgery in severe cases.

Medical Treatment for Achilles Tendonitis

Simple pain relievers
E.g., Paracetamol (Acetaminophen) for mild to moderate pain.
Used according to instructions or doctor’s advice.
Nonsteroidal anti-inflammatory drugs (NSAIDs)
E.g., Ibuprofen or Naproxen to reduce pain, swelling, and inflammation.
Used for short periods under medical guidance.
Caution in patients with stomach, liver, or kidney issues.
Muscle relaxants
For calf muscle spasms caused by pain.
Helps improve comfort and movement.
Sleep-aiding medications
In severe pain that affects sleep, doctors may prescribe mild medications for better rest.

Tips during medication treatment:

Follow prescribed doses carefully.
Combine medication with rest and use of ice or heat as appropriate.
Consult a doctor if pain persists or new symptoms appear, like severe swelling or foot weakness.

Types of Achilles Tendon Surgery

Debridement
- Removing inflamed or degenerated tissue to relieve pain and improve flexibility.
- Common in chronic inflammation without full tear.
Tendon repair
- For partial or complete tears.
- Tendon fibers are stitched and reconnected.
- Sometimes grafts from other tendons are used if damage is extensive.
Tendon augmentation or reconstruction
- For severe tears or significant degeneration.
- Uses tendons from the same leg or other areas to support and restore tendon strength.
Minimally invasive surgery
- Small incision to remove inflamed tissue or repair tendon.
- Shorter recovery time and less postoperative pain than traditional open surgery.

Recovery After Surgery

Usually takes several weeks depending on the type of surgery and tendon damage.
Use a splint or brace initially to stabilize the foot.
Gradual sitting and standing to reduce tendon stress.
Follow-up with a physiotherapist for strengthening and mobility exercises once cleared by the doctor.

Post-surgery tips:

Avoid walking or running initially as instructed.
Use pain relievers as needed.
Gradually follow light exercises to strengthen the tendon and surrounding muscles.

Physical Therapy and Exercises for Achilles Tendonitis

Exercises are essential in conservative treatment to strengthen the tendon, improve flexibility, and reduce pain.

Stretching exercises
- Increases tendon and calf muscle flexibility.
- Examples:
  - Calf stretch: Stand facing a wall, injured leg behind with heel on the ground, lean forward slowly.
  - Seated tendon stretch: Sit with leg extended, gently pull foot upwards using a towel.
Strengthening exercises
- Strengthens muscles around the tendon to reduce stress.
- Examples:
  - Heel raises: Stand on a step or flat surface, lift heel slowly, then lower gradually.
  - Can be done on one or both legs depending on tolerance.
Low-impact exercises
- Movement without overloading the tendon.
- Examples: Swimming, stationary cycling.
Eccentric exercises
- Important for chronic cases.
- Lift heel on one leg, then lower more slowly than the lift.
- Helps rebuild tendon fibers and strengthen the tendon.

Tips during exercises:

Start slowly and increase intensity gradually.
Stop immediately if severe pain or swelling occurs.
Combine exercises with rest and ice packs after activity.
Consult a physiotherapist for a personalized program.

Tips for Managing Achilles Tendonitis

Rest and reduce strain
Limit activities involving running, jumping, or heavy lifting.
Be careful when walking or climbing stairs.
Use ice and heat
Ice packs in the first few days to reduce pain and swelling.
After 2–3 days, heat packs can relieve stiffness and improve blood flow.
Wear proper shoes and heel support
Use supportive athletic shoes with soft cushioning.
Heel pads can reduce tendon pressure.
Stretching and strengthening exercises
Follow physiotherapist instructions regularly.
Start gradually to avoid overloading the tendon again.
Avoid activities that increase pain
Avoid running on hard surfaces or intense sports.
Avoid heavy lifting or sudden leg movements during inflammation.
Monitor symptoms and follow-up with doctor
See a doctor if severe swelling, redness, or persistent pain occurs.
Follow-up prevents chronic complications or full tendon rupture.
Maintain a healthy weight
Excess weight increases tendon stress during walking or daily activities.

Recovery Time for Achilles Tendonitis

Mild cases: Pain after activity, usually improves within 2–4 weeks with rest, ice, and simple exercises.
Moderate cases: Persistent pain with mild swelling or stiffness, requiring 4–8 weeks with medication, stretching, strengthening exercises, and supportive shoes.
Chronic or severe cases: Persistent pain, stiffness, or tendon degeneration, may require 2–6 months with gradual exercise programs and specialized physiotherapy.
Post-surgery: Healing after partial or complete tendon repair usually takes 3–6 months, with immobilization and progressive mobility and strengthening exercises.