That sensation of stepping on a small, hard object that is not actually there almost always traces to something happening in the ball of your foot, the padded area just behind your toes. The most frequently blamed culprit is Morton’s neuroma, a thickening of tissue around a nerve between the metatarsal bones, but several other conditions produce the same unmistakable “golf ball underfoot” feeling. Sorting out which one is responsible matters, because the treatments differ considerably.
Morton’s Neuroma and the Condition Often Mistaken for It
Morton’s neuroma is the diagnosis most people land on after searching this symptom, and for good reason. It involves a buildup of fibrous tissue around a nerve that runs between the metatarsal heads, most often between the third and fourth toes. When you put weight on that area, the swollen nerve gets compressed between the bones, and the result is a sharp, burning pain or a feeling that something round is lodged under the ball of your foot. Many people describe it as standing on a pebble or marble. The sensation can radiate into the toes as tingling or numbness, and it tends to get worse as the day goes on or after long periods of standing.
What makes diagnosis tricky is that a neighboring structure, the intermetatarsal bursa, a small fluid-filled sac that cushions the space between metatarsal heads, can become inflamed and produce nearly identical symptoms. A prospective study comparing MRI and ultrasound in patients with pain between the metatarsals found that more than half the cases involved bursitis rather than a true neuroma, and that patients with an actual neuroma tended to have more severe pain and a longer history of symptoms than those with bursitis alone.1MDPI (Diagnostics). Morton’s Neuroma or Intermetatarsal Bursitis—A Prospective Diagnostic Study of Intermetatarsal Pain The distinction matters because bursitis often responds well to anti-inflammatory measures and rest, while a neuroma that has been growing for months or years may need more targeted intervention.
How Your Foot Shape Shifts Pressure to the Wrong Spot
Not everyone who gets that golf-ball feeling has a neuroma or bursitis. Sometimes the problem is mechanical: the way your foot distributes weight across its surface during walking can overload certain areas and create a sensation of pressure or a lump where none exists.
A high-arched foot, known clinically as pes cavus, concentrates force on a narrower strip of the sole. Research has shown that people with high arches experience abnormally high pressure-time integrals under the forefoot, and that this elevated pressure is directly related to foot pain.2PubMed. The effect of pes cavus on foot pain and plantar pressure Because the arch does not flex down to share the load with the midfoot, the metatarsal heads absorb more impact with every step. Over time, this can inflame the soft tissues in the ball of the foot and make it feel as though you are stepping on something hard.
Flat feet create a different but related problem. When the arch collapses, the foot rolls inward during the push-off phase of walking, and pressure shifts toward the inner metatarsal heads. A study of plantar pressure in adolescents with high body mass found that midfoot pressure rose significantly with BMI, consistent with arch collapse, and that forefoot push-off pressure dropped, meaning the foot was not distributing force efficiently.3PubMed Central. Prevalence of flatfoot and analysis of plantar pressure distribution in adolescents based on body mass index: a regional study In adults, these imbalances can contribute to chronic forefoot pain that mimics the golf-ball sensation even without a discrete lesion.
One factor that is widely assumed to play a role but may not is thinning of the plantar fat pad, the cushioning layer under the metatarsal heads. It sounds intuitive: lose your natural padding, and bony prominences start pressing into the ground. But a study examining the relationship between fat-pad thickness and forefoot pain found no meaningful correlation between the two. Pain frequency and intensity were not significantly linked to how thick or thin the fat pad was under the second and third metatarsal heads.4PubMed Central. Plantar fat pad atrophy: a cause of metatarsalgia? This does not mean fat-pad thinning never contributes to discomfort, but it suggests the relationship is not as straightforward as many clinicians once thought.
Lumps You Can Sometimes Feel
When the golf-ball sensation is accompanied by a palpable nodule under the skin, two conditions deserve attention. The first is plantar fibromatosis, also called Ledderhose disease, a disorder in which fibrous tissue proliferates within the plantar fascia itself. The nodules tend to develop along the arch of the foot rather than right under the ball, but as they grow they can shift how you walk and create secondary pressure problems in the forefoot.5PubMed Central. The successful use of collagenase for Ledderhose disease (plantar fibromatosis) in a paediatric patient: a case report Plantar fibromas are benign, but they can be stubborn, and the nodules sometimes enlarge over months or years.
The second possibility is a ganglion cyst forming on the plantar surface. These fluid-filled sacs are more commonly associated with the wrist, but they can develop deep beneath the plantar fascia near the metatarsals. A case report documented a periosteal ganglion cyst on the underside of a metatarsal bone that was so deep it was not obvious on physical exam. It was eventually detected on imaging, and the cyst had actually caused a stress fracture in the overlying metatarsal from chronic pressure.6PubMed Central. Metatarsal Periosteal Plantar Ganglion Cyst Associated With Stress Fracture: A Case Report Cases like this are rare, but they illustrate why a persistent golf-ball sensation that does not improve with simple measures deserves imaging.
Nerve Compression at the Ankle
Morton’s neuroma is not the only nerve-related cause. Tarsal tunnel syndrome involves compression of the posterior tibial nerve as it passes through a narrow channel on the inner side of the ankle. From there, branches of the nerve fan out across the sole of the foot, so entrapment at the ankle can produce symptoms that feel like they are coming from the ball of the foot. The hallmark is pain, tingling, numbness, or a burning sensation along the bottom of the foot, sometimes accompanied by difficulty walking.7PubMed Central. Tarsal Tunnel Syndrome – A Comprehensive Review
Tarsal tunnel syndrome can be tricky to distinguish from Morton’s neuroma because the symptoms overlap. A few clues can help: tarsal tunnel pain tends to be more diffuse across the sole rather than concentrated between two specific toes, and tapping the inside of the ankle may reproduce the symptoms. It can also cause weakness in the small muscles of the foot over time, which is something Morton’s neuroma typically does not do.8International Journal For Multidisciplinary Research. Effectiveness of Ultrasound and Nerve Mobilization Exercise in Tarsal Tunnel Syndrome If your golf-ball feeling is accompanied by widespread sole numbness or burning that extends beyond the forefoot, this is worth raising with your doctor.
When Arthritis Is Involved
Rheumatoid arthritis has an outsized effect on the feet compared with other joints. About 90 percent of people with rheumatoid arthritis eventually develop foot involvement, and the forefoot is the most commonly affected area.9PubMed Central. The rheumatoid forefoot The disease erodes the joints at the base of the toes, called the metatarsophalangeal joints, causing them to become unstable and eventually dislocate. When these joints shift out of alignment, the metatarsal heads drop lower toward the sole, and walking on them feels like stepping on marbles or stones.
The inflammatory process associated with rheumatoid arthritis can also trigger secondary problems, including Morton’s neuroma and painful calluses over prominent bone. So someone with rheumatoid arthritis describing a golf-ball sensation may have more than one thing going on simultaneously. The foot becomes a cascading problem: joint instability leads to abnormal pressure, which leads to nerve irritation, which leads to additional pain on top of the joint inflammation itself.
What Your Shoes Are Doing
Footwear does not usually cause these conditions on its own, but it can amplify the discomfort dramatically or contribute to the mechanical overload that sets them in motion. A study measuring in-shoe pressure across three shoe types found that flat shoes produced the highest pressure on the outer metatarsal heads and hindfoot, while high heels concentrated the most pressure on the first and second metatarsal heads.10PubMed Central. Change of In-Shoe Plantar Pressure According to Types of Shoes (Flat Shoes, Running Shoes, and High Heels) Running shoes, by contrast, distributed pressure more evenly. The takeaway is that both extremes, very flat shoes with no support and high heels that pitch your weight forward, push disproportionate force through the forefoot.
Narrow toe boxes compound the problem for anyone prone to Morton’s neuroma. When the metatarsal heads are squeezed together, the nerve between them has less room, and even mild swelling can become symptomatic. Pointed-toe shoes and stiff dress shoes are repeat offenders. If your golf-ball feeling reliably worsens in certain shoes and improves when you go barefoot or switch to wider, cushioned footwear, that pattern itself is diagnostically useful.
For runners, the issue is less about shoe shape and more about repetitive impact. Research on military recruits with a history of metatarsal stress fractures found that those who developed fractures spent more time loading the forefoot during their running gait, with peak rearfoot motion occurring earlier in the stride cycle.11PubMed. Comparison of static and dynamic biomechanical measures in military recruits with and without a history of third metatarsal stress fracture Stress fractures do not always produce the classic golf-ball feeling, but they can, especially when the fracture is in a metatarsal head. Runners who notice a new localized pressure sensation under the ball of the foot that worsens with activity should not dismiss it as a neuroma without investigation.
How Doctors Sort It Out
Given how many conditions can create the same subjective sensation, a clinical exam is the starting point but rarely the whole story. For Morton’s neuroma specifically, a skilled clinician squeezing the forefoot and reproducing the characteristic clicking sensation, known as Mulder’s sign, has high accuracy. One study found that clinical assessment alone had a sensitivity of 98 percent for detecting Morton’s neuroma, compared with 90 percent for ultrasound and 88 percent for MRI.12PubMed. Morton’s neuroma: A clinical versus radiological diagnosis
That sounds like imaging is unnecessary, but the picture is more nuanced. As the intermetatarsal bursitis data mentioned earlier showed, ultrasound and MRI can reveal conditions the clinical exam might not distinguish from a neuroma. Imaging becomes especially important when the pain does not respond to initial treatment, when the location is atypical, or when the clinician suspects something deeper like a ganglion cyst or stress fracture. Ultrasound is often the first-line imaging choice because it is quick, inexpensive, and allows the clinician to watch the structures move in real time while squeezing the foot. MRI offers better soft-tissue contrast and is better at detecting bone-related pathology.
If the pain is diffuse rather than pinpoint, or if it radiates from the ankle into the sole, nerve conduction studies may be ordered to check for tarsal tunnel syndrome. And if there is any suspicion of an inflammatory condition like rheumatoid arthritis, blood tests for inflammatory markers and autoantibodies are part of the workup.
Sesamoid Problems Under the Big Toe
The golf-ball sensation does not always occur in the middle of the forefoot. If it is concentrated under the big toe, the sesamoid bones may be to blame. These are two small, pea-sized bones embedded in the tendons beneath the first metatarsal head. They act as pulleys, helping the big toe push off the ground. When they become inflamed, fractured, or develop degenerative changes, the area under the big toe joint can feel like you are walking on a stone.
Sesamoid problems are common in dancers, runners, and people who spend a lot of time on the balls of their feet. A less common variant involves the sesamoid bone under the big toe’s interphalangeal joint, farther toward the tip. Inflammation here can alter the way the big toe moves and create pain with each step.13PubMed Central. Subhallucal Interphalangeal Sesamoiditis: A Rare Cause of Chronic Great Toe Pain The location of the pain is the best clue: sesamoiditis hurts directly under the big toe joint, while Morton’s neuroma hurts farther back and typically between the second and third or third and fourth toes.
Practical Steps That Help
For most of these conditions, the first line of defense is reducing the mechanical load on the painful spot. Metatarsal pads, small dome-shaped cushions that stick inside a shoe, work by redistributing pressure away from the metatarsal heads. Placement matters more than most people realize. Research on optimal metatarsal pad positioning found that the pad needs to sit just behind the metatarsal heads, so its peak pressure zone falls proximal to (just behind) the tender spot. When positioned correctly, forefoot pressure dropped significantly compared with no pad at all.14PubMed. Optimum position of metatarsal pad in metatarsalgia for pressure relief A pad placed too far forward actually increases pressure on the problem area, which is a common mistake when people apply them at home without guidance.
Beyond padding, switching to shoes with a wider toe box and a supportive midsole makes a meaningful difference, especially for Morton’s neuroma and bursitis. Reducing time in high heels or rigid flats, as the pressure research suggests, takes load off the forefoot. For runners, evaluating cadence and foot-strike pattern with a sports-medicine professional can help identify whether gait mechanics are contributing.
When conservative measures do not resolve the problem, the next steps depend on the diagnosis:
- Morton’s neuroma: Corticosteroid injections can shrink the inflamed tissue temporarily. If those fail, alcohol sclerosing injections or surgical excision of the neuroma are options.
- Intermetatarsal bursitis: Anti-inflammatory medications and ice often resolve flare-ups. Steroid injections into the bursa can help persistent cases.
- Plantar fibromatosis: Treatment ranges from orthotics and physical therapy to collagenase injections or surgery for large, painful nodules.
- Tarsal tunnel syndrome: Nerve mobilization exercises and ultrasound therapy have shown benefit, and surgical decompression of the tarsal tunnel is considered when conservative treatment fails.
- Sesamoiditis: Offloading the big toe joint with a stiff-soled shoe or custom orthotic is the mainstay. Fractures that do not heal may eventually need surgical removal of the sesamoid bone.
When to Take It Seriously
Most causes of the golf-ball sensation are benign and manageable, but a few warning signs warrant prompt attention. If the pain appeared suddenly after an injury or a significant increase in activity, a stress fracture should be ruled out. If the area is warm, red, or swollen, infection or an acute inflammatory flare from a condition like gout or rheumatoid arthritis is possible. If you notice progressive numbness or weakness in the foot, nerve compression may be worsening and delaying evaluation could lead to lasting damage.
Persistent forefoot pain that does not respond to a few weeks of sensible footwear changes, padding, and rest is also worth investigating. The earlier a Morton’s neuroma is identified, for example, the more likely it is to respond to non-surgical treatment. Letting it progress for months tends to make the fibrous thickening more entrenched, and the treatment options narrow accordingly. The golf-ball feeling is your foot telling you something specific about what is happening under the surface. The question is which structure is doing the talking, and getting that right changes everything about what to do next.