Numbness in one heel usually points to a compressed or irritated nerve, either locally in the foot and ankle or further up in the lower spine. Because several nerves supply sensation to the heel, the exact location and pattern of numbness helps narrow down the cause. The most common culprits are nerve entrapments near the ankle, a herniated disc in the lower back, and less frequently, early peripheral neuropathy from conditions like diabetes.
Tarsal Tunnel Syndrome
The tarsal tunnel is a narrow passageway on the inside of your ankle where a major nerve, the tibial nerve, passes alongside tendons and a blood vessel. When something compresses the tibial nerve inside this tunnel, it causes pain, numbness, tingling, and sometimes a strange sensation of walking on pebbles or sand. The numbness and tingling follow the nerve’s path into the sole and heel, since the tibial nerve splits into two branches (the medial and lateral plantar nerves) that supply feeling to the bottom of your foot.
Symptoms typically start out as intermittent, coming and going with activity, but in longstanding cases they can become constant as the nerve sustains more damage. People often describe the pain as burning, aching, or stabbing. Swelling from an ankle sprain, a cyst, varicose veins, or flat feet can all crowd the tarsal tunnel and trigger compression.
Diagnosing tarsal tunnel syndrome can be tricky. There is no single definitive test for it, so doctors rely heavily on your symptoms and a physical exam. The most commonly used exam technique is the Tinel test, where a doctor taps repeatedly over the tarsal tunnel to see if it reproduces tingling or pain. This test has a specificity of 70% to 90%, meaning a positive result is fairly reliable, but its sensitivity ranges from just 25% to 75%, so a negative result doesn’t rule it out. Another useful test involves passively bending your foot upward and outward and holding that position for 10 seconds. This reproduces symptoms in about 82% of people with tarsal tunnel syndrome. Nerve conduction studies are used in roughly 80% of cases to confirm the diagnosis.
Baxter’s Nerve Entrapment
Baxter’s nerve is a small branch of the lateral plantar nerve that specifically supplies sensation to the heel. It can become pinched between muscles deep in the foot, most often between the muscle that moves the big toe (abductor hallucis) and a deeper muscle called the quadratus plantae. Compression here causes localized pain, tingling, numbness, or a burning sensation concentrated in the heel itself, rather than spreading across the whole sole.
This condition is one of the most commonly overlooked causes of chronic heel pain and numbness. It’s frequently mistaken for plantar fasciitis because both cause heel discomfort, but the key difference is the nerve-related symptoms: burning, tingling, and actual loss of sensation. Baxter’s neuropathy also tends to worsen after walking and at night, whereas plantar fasciitis produces its worst pain during the first steps in the morning.
Herniated Disc and S1 Nerve Root Compression
A herniated disc in the lower back can cause heel numbness even though the problem originates far from your foot. The S1 nerve root, which exits the spine at the base of the lumbar region, sends signals down the back of the leg to the outside and bottom of the foot, including the heel. When disc material presses on this nerve root, it creates numbness, tingling, or pain that radiates from the lower back all the way down.
This is a form of sciatica, and the pattern of numbness helps distinguish it from a local nerve problem in the foot. S1 compression typically causes symptoms down the back of the calf and into the heel and outer foot. You might also notice weakness when pushing off on your toes or a diminished ankle reflex. By contrast, compression of the L5 nerve root (one level higher) causes numbness along the side of the leg and top of the foot, not the heel. If your heel numbness comes with back pain or pain shooting down your leg, a spinal issue is a strong possibility.
Peripheral Neuropathy
Peripheral neuropathy, most commonly caused by diabetes, damages the small nerves in your feet over time. High blood sugar and elevated triglycerides gradually injure both the nerves and the tiny blood vessels that feed them. While this condition usually affects both feet, it can show up on one side first, especially in the early stages. Other conditions that cause peripheral neuropathy include vitamin B12 deficiency, thyroid disorders, kidney disease, liver disease, alcohol use disorder, and certain autoimmune diseases like lupus, Sjogren’s syndrome, and Guillain-Barré syndrome.
The numbness from peripheral neuropathy tends to develop gradually and often starts at the tips of the toes before creeping toward the heel and up the foot over months or years. If you have unexplained numbness in one heel and risk factors like diabetes or heavy alcohol use, blood tests can check for blood sugar levels, thyroid function, kidney health, and B12 levels to identify a treatable cause.
How Nerve Numbness Differs From Plantar Fasciitis
Plantar fasciitis is the most common cause of heel pain, but it doesn’t typically cause numbness. It produces a sharp or aching pain under the heel that’s worst with the first steps in the morning or after sitting for a long time. There’s no tingling, no burning electrical sensation, and no loss of feeling. If you’re experiencing actual numbness, reduced sensation, or a pins-and-needles feeling in your heel, a nerve problem is far more likely than plantar fasciitis.
That said, the two conditions can coexist. Chronic swelling from plantar fasciitis can compress nearby nerves, especially Baxter’s nerve, adding numbness on top of the original heel pain.
Exercises That Help Nerve-Related Heel Numbness
When the cause is nerve compression at the ankle (tarsal tunnel syndrome or Baxter’s neuropathy), targeted stretching and strengthening can reduce the swelling and muscle tightness that crowd the nerve. Three approaches are particularly useful:
- Calf stretches: Stand facing a wall with your affected leg stepped back, knee locked, and heel pressed toward the floor. Bend your front knee and lean in until you feel a stretch in the back of the rear leg. Hold for 20 seconds. This relieves tightness in the muscles around the ankle that contribute to nerve compression.
- Heel lifts: Stand holding a chair or counter for support and slowly rise onto your toes. Hold the tip-toe position for five seconds, then lower back down. This strengthens the posterior tibialis tendon, a structure that runs through the tarsal tunnel. Repeat three to five times daily.
- Plantar stretches: Sit with your legs extended and loop a towel or resistance band around the ball of your foot. Gently pull the top of your foot toward your body until you feel a stretch in your heel and calf. Hold for 20 seconds, repeating three to five times daily.
Ankle rotations, where you slowly circle your foot in both directions, help maintain flexibility and reduce stiffness that worsens nerve compression. For spinal causes like a herniated disc, these foot exercises won’t address the root problem. Treatment in those cases focuses on the lower back through physical therapy, core strengthening, and sometimes epidural injections or surgery if symptoms are severe or progressive.
Regardless of the cause, persistent or worsening numbness in one heel, especially if accompanied by muscle weakness, difficulty walking, or changes in bladder or bowel function, warrants prompt medical evaluation. Numbness that spreads beyond the heel or starts affecting both feet may signal a systemic condition that needs treatment before further nerve damage occurs.