The hallmark sign of plantar fasciitis is a stabbing pain in the bottom of your foot near the heel, especially with your first steps in the morning. If that specific pattern sounds familiar, there’s a good chance you’re dealing with it. But several other conditions cause heel pain too, so it helps to know exactly what to look for and what rules it out.
The Classic Pain Pattern
Plantar fasciitis produces pain in a very specific spot: the inside-bottom of your heel, right where a thick band of tissue (the plantar fascia) connects to the heel bone. The pain is usually sharp or stabbing, not dull or achy, and it doesn’t radiate outward into your toes or ankle.
What makes this condition distinctive is its relationship to rest and activity. Pain is worst with your first few steps after sleeping or sitting for a long time. It then eases up as you walk around for a few minutes. You might feel relatively fine during a workout or while walking, only to have the pain return once you stop and rest. By the end of the day, after hours of accumulated weight-bearing, the pain typically flares again. This cycle of “hurts after rest, improves with movement, returns after prolonged activity” is the single most recognizable feature of plantar fasciitis.
Two Self-Checks You Can Try at Home
The first is simple: press your thumb firmly into the inside front edge of your heel pad, right where the arch begins. If this produces a sharp, recognizable version of your usual pain, that’s a strong indicator. This is the exact spot where the plantar fascia attaches to bone, and tenderness here is one of the primary criteria clinicians use to make a diagnosis.
The second is a version of what physical therapists call the Windlass test. Sit down with your affected foot flat on the floor. Use your hand to pull your big toe upward toward your shin, bending it back as far as it will comfortably go. If this movement reproduces your heel pain, the test is positive. This works because pulling the toe back tightens the plantar fascia like a bowstring, putting tension directly on the inflamed attachment point. The test is more telling if you do it while standing (place the ball of your foot on the edge of a step and pull the big toe up), though even the seated version can be informative.
Risk Factors That Raise the Odds
Plantar fasciitis is most common between ages 40 and 60. A BMI approaching or above 30 significantly increases risk, as does spending most of your workday on your feet, especially on hard surfaces. Long-distance runners, ballet dancers, and anyone who recently ramped up weight-bearing exercise are more vulnerable. Flat feet, high arches, and tight calves (limited ankle flexibility) all contribute as well.
Footwear matters more than most people realize. Thin-soled shoes, worn-out sneakers, unsupportive flats, and high heels all increase strain on the plantar fascia. One occupational study found that workers who rotated between different pairs of shoes during the week had a lower risk of developing the condition compared to those who wore the same pair every day.
What It’s Not: Conditions That Mimic It
Tarsal Tunnel Syndrome
This is a nerve compression issue on the inner side of the ankle, and it’s the most commonly confused condition. The key difference is sensation. Tarsal tunnel syndrome causes burning, tingling, numbness, or an electric “pins and needles” feeling that can radiate into the toes. Plantar fasciitis does not cause numbness or tingling, ever. If your heel pain comes with any nerve-type sensations, that points away from fasciitis. Tarsal tunnel pain can also show up at rest in the evening without any preceding activity, while plantar fasciitis pain is closely tied to weight-bearing patterns.
Heel Fat Pad Problems
The fat pad under your heel acts as a natural shock absorber, and it thins with age. When it does, standing on hard surfaces barefoot becomes painful, sometimes excruciating. The distinguishing feature: fat pad pain is centered directly under the heel bone rather than at the front-inside edge, and it responds dramatically to cushioning. If soft-soled shoes or silicone heel cups make a major difference, and you simply cannot tolerate any hard surface without footwear, fat pad atrophy may be playing a role. Plantar fasciitis pain, by contrast, is more about the first-step-after-rest pattern than about surface hardness alone.
Heel Spurs
If you’ve had an X-ray that showed a heel spur, you might assume that’s your problem. It probably isn’t. Heel spurs are bony growths that develop at the plantar fascia’s attachment point, often as a result of longstanding tension. But most people who have heel spurs on X-ray have no heel pain at all. The American Academy of Orthopaedic Surgeons states plainly that heel spurs do not cause plantar fasciitis pain, and the condition can be treated without removing the spur.
Do You Need Imaging?
Probably not. Plantar fasciitis is diagnosed based on your symptoms and a physical exam, not imaging. X-rays, MRIs, and ultrasounds are rarely needed for an initial diagnosis. Clinical guidelines from both the American Academy of Family Physicians and the Journal of Orthopaedic & Sports Physical Therapy recommend reserving imaging for cases that don’t improve after weeks of conservative treatment, or when a clinician suspects something else is going on, like a stress fracture, nerve entrapment, or a tear in the fascia itself. If imaging is pursued, a standing X-ray comes first to rule out bone problems, followed by ultrasound or MRI if the X-ray is clean but symptoms persist.
The Diagnostic Checklist Clinicians Use
Physical therapists and physicians use a specific set of criteria to confirm plantar fasciitis. You don’t need to meet every single one, but the more boxes you check, the more confident the diagnosis:
- Pain location: inner-bottom heel, near where the arch starts
- First-step pain: worst with initial steps after sleeping or sitting, also worse after prolonged standing
- Recent activity change: pain started after an increase in walking, running, or time on your feet
- Tenderness on palpation: sharp pain when you press the front-inside edge of the heel
- Positive Windlass test: pulling the big toe back reproduces your heel pain
- No nerve symptoms: no tingling, numbness, or burning that would suggest tarsal tunnel syndrome
- Limited ankle flexibility: difficulty pulling your foot upward toward your shin
- Higher BMI (in non-athletes) or flat feet/high arches
If you recognize most of this pattern, particularly the first-step morning pain, the specific tender spot on the heel, and the absence of tingling or numbness, plantar fasciitis is the most likely explanation. The condition affects roughly two million Americans per year and accounts for the vast majority of heel pain complaints, so the odds are in favor of this diagnosis when the classic symptoms are present.