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Heel pain can be confusing because different conditions can hurt in similar areas. Two common causes are Achilles tendonitis and plantar fasciitis.
Both involve soft tissue irritation. Both can make walking, standing, exercise, and daily activity uncomfortable. One of the clearest differences is where the pain is felt. Achilles tendonitis typically causes pain at the back of the heel or above it, while plantar fasciitis typically causes pain on the bottom of the heel.
Knowing the difference between Achilles tendonitis and plantar fasciitis matters because treatment depends on the source of the pain.
What Is Achilles Tendonitis?
The Achilles tendon connects the calf muscles to the heel bone. It helps you push off when you walk, run, climb stairs, jump, or rise onto your toes.
Achilles tendonitis, also commonly called Achilles tendinopathy, can develop when repeated or excessive loading places strain on the Achilles tendon. Pain often develops at the back of the heel or just above it. Some people feel stiffness when they first get moving, while others notice pain after running, sports, long walks, or standing for long periods.
Common symptoms include:
- Pain at the back of the heel or above the heel
- Morning stiffness or stiffness after rest
- Tenderness along the Achilles tendon
- Swelling or thickening near the tendon
- Pain that worsens after activity
- Difficulty running, jumping, or climbing stairs
Achilles tendonitis often starts as a mild ache after activity and becomes more persistent if the tendon continues to absorb the same strain.
What Is Plantar Fasciitis?
The plantar fascia is a strong band of tissue that runs along the bottom of the foot, connecting the heel to the front of the foot and helping support the arch.
Plantar fasciitis occurs when this tissue becomes irritated near the heel. The pain from this condition is mainly felt on the bottom of the heel, often toward the inner side.
The pain is often worse during the first few steps in the morning. It may also return after sitting, standing for long periods, walking on hard surfaces, or increasing activity.
Common symptoms include:
- Pain under the heel
- Pain along the inside of the heel
- Morning heel pain
- Pain after sitting or resting
- Discomfort after standing for long periods
- Tightness through the arch or calf
Like Achilles tendonitis, plantar fasciitis usually develops gradually.
Achilles Tendonitis vs Plantar Fasciitis: Where Does It Hurt?
One of the easiest ways to tell the difference is where the pain shows up.
The pain from Achilles tendonitis tends to be felt in the heel area or further up, along the Achilles tendon. The pain from plantar fasciitis tends to be felt on the bottom of the heel.
A simple way to think about it:
- Back of the heel: more likely Achilles tendonitis
- Bottom of the heel: more likely plantar fasciitis
- Pain above the heel: more likely Achilles tendonitis
- Pain with first steps in the morning: often plantar fasciitis
- Pain with pushing off, running, or climbing stairs: often Achilles tendonitis
Some patients can have both conditions at the same time, especially when tight calf muscles and foot mechanics place strain on both the Achilles tendon and the plantar fascia.
Why Conditions Like Achilles Tendonitis vs Plantar Fasciitis Get Confused
Achilles tendonitis and plantar fasciitis are often confused because both can cause heel pain, both may be worse after rest, and both can flare with activity.
They also share common risk factors, including:
- Tight calf muscles
- Flat feet or high arches
- Poor shoe support
- Sudden increases in walking, running, or exercise
- Standing for long periods
- Hard walking surfaces
- Changes in activity level
- Foot mechanics that place extra strain on the heel
The difference is which soft tissue structure is irritated.
How a Podiatrist Tells the Difference
A podiatrist will usually start by asking where the pain occurs, when it feels worst, and which activities make it better or worse.
During the exam, a podiatrist may:
- Press along the Achilles tendon
- Press along the heel and arch
- Check ankle and calf flexibility
- Evaluate foot structure
- Observe how you walk
- Test strength and movement
- Look for swelling, thickening, or tenderness
- Review footwear and activity patterns
X-rays may be taken to look for bone abnormalities and rule out other causes of heel pain, such as fractures or arthritis. Heel spurs may also appear on X-rays, although they are common and are not generally considered the cause of plantar fasciitis. Ultrasound or MRI may be considered when the diagnosis is unclear or a soft tissue injury is suspected.
Why Soft Tissue Injuries Can Take Time to Heal
Achilles tendonitis and plantar fasciitis both involve tissues that work every time you stand, walk, or push off the foot.
This makes it hard to fully rest. Even everyday movements can continue to stress the injured area. This is why heel pain might persist beyond expectations.
Recovery usually requires reducing strain while improving support, flexibility, and foot mechanics.
Treatment for Achilles Tendonitis
Achilles tendonitis treatment depends on where the tendon is irritated, how long symptoms have been present, and how much pain affects activity.
Treatment may include:
- Activity modification
- Supportive footwear
- Heel lifts when appropriate
- Stretching and strengthening
- Physical therapy
- Bracing or immobilization in some cases
- Anti-inflammatory medication when appropriate
- Custom orthotics if foot mechanics are contributing
- Shockwave therapy for stubborn symptoms
The right plan may look different for insertional Achilles tendonitis, which affects the tendon attachment at the heel, compared with mid-portion Achilles tendonitis, which affects the tendon above the heel.
Treatment for Plantar Fasciitis
Plantar fasciitis treatment focuses on reducing strain on the bottom of the heel while improving support and flexibility.
Treatment may include:
- Supportive shoes
- Calf and plantar fascia stretching
- Custom orthotics
- Heel cushioning
- Activity changes
- Physical therapy
- Night splints
- Anti-inflammatory medication when appropriate
- Corticosteroid injections in selected cases
- Shockwave therapy for persistent cases
Most patients do not need surgery for plantar fasciitis. Conservative care is usually the first step.
Where Shockwave Therapy May Fit
Shockwave therapy may be used for chronic soft tissue injuries that have not improved enough with standard conservative care.
For plantar fasciitis, it may be considered when heel pain continues despite supportive footwear, stretching, orthotics, activity changes, or physical therapy.
For Achilles tendonitis, it may be considered in selected cases when tendon pain has become stubborn and other non-surgical treatments have not provided enough relief.
Shockwave therapy uses controlled acoustic waves to stimulate the painful tissue. It does not require an incision, and it is usually part of a broader treatment plan.
What About Stem Cell Treatment or Wharton’s Jelly?
Some patients ask about stem cell treatment, Wharton’s jelly, or other regenerative medicine options for tendon and fascia pain.
These treatments are often marketed for soft tissue injuries, but patients should be cautious. Regenerative products such as stem cells, Wharton’s jelly, amniotic products, and exosomes are not currently FDA-approved to treat orthopedic conditions such as tendonitis or plantar fasciitis.
That does not mean patients should avoid asking questions. It means these options should be discussed carefully with a qualified foot and ankle specialist
When Should You See a Podiatrist?
Heel pain should be evaluated when it lasts longer than a few weeks, keeps returning, or interferes with walking, work, exercise, or daily life.
You should consider scheduling a podiatry visit if you have:
- Pain at the back of the heel
- Pain under the heel
- Morning heel pain
- Pain that worsens after activity
- Swelling or tenderness near the Achilles tendon
- Heel pain that is not improving with home care
- Trouble walking, running, or climbing stairs
- Symptoms that began after an injury
- Diabetes, circulation problems, or numbness in the feet
A podiatrist will determine whether the pain is due to the Achilles tendon, the plantar fascia, or something else that requires a different treatment approach.
Do Not Guess About Heel Pain
Although they share many commonalities, Achilles tendonitis and plantar fasciitis occur in different areas of the foot and heel region. Achilles tendonitis involves heel pain at the back of the heel or in the tendon near the back of the heel. Plantar fasciitis involves heel pain at the bottom of the heel or along the foot’s arch.
Both conditions can be frustrating when they linger. Heel pain often improves once the source of the strain is identified and the treatment plan matches the diagnosis.
Our podiatrists at Vale Foot and Ankle Surgery will help you figure out what is causing your heel pain by examining the symptoms, feet structure, gait, shoes, and activity level.
If heel pain is making it harder to walk, work, exercise, or get through the day comfortably, contact us today to schedule an evaluation.
