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When the area around the ankle malleolus throbs and hurts, many people mistakenly think "I must have sprained my ankle" and leave it untreated. However, depending on whether the pain is on the inner or outer side, the related structures and diseases to suspect differ significantly. In this article, we first organize three key points.
— The main causes of inner malleolus pain are deltoid ligament injury, posterior tibial tendinitis, tarsal tunnel syndrome, and accessory navicular syndrome. — The main causes of outer malleolus pain are ankle sprain (lateral ligament injury), peroneal tendinitis, and subcutaneous bursa inflammation. — If ankle pain persists for more than 2 weeks or is accompanied by numbness and swelling, differentiation through medical consultation is needed rather than self-diagnosis.
The underlying disease differs depending on which side of the malleolus hurts
Many people complaining of ankle pain say, "I thought I just sprained it and rested for a few days, but it didn't get better." However, the foot and ankle are far more complex and intricate structures than we think. They are composed of 26 bones, 38 muscles, and 125 ligaments, and absorb loads equivalent to about 6 times body weight with each step. Because of such a complex structure, the causes of pain vary widely, including ligament injury, tendinitis, bursitis, and nerve problems.
According to clinical data, approximately 70% of ankle pain is explained by ligament injury (sprain), plantar fasciitis, and Achilles tendon pathology, while the remainder is known to stem from arthritis, impingement syndrome, neuralgia, and others. What matters is the location where the pain occurs. Since different ligaments, tendons, and nerve structures pass through the inner (medial) and outer (lateral) sides of the malleolus respectively, identifying which side hurts first becomes the starting point for differentiation. Rather than lumping pain together with just the impression "I think I sprained it," subdividing and examining pain location is the first step toward rapid recovery.
If the inner malleolus (medial malleolus) hurts — 4 main causes
The causes of inner malleolus pain can be broadly divided into four categories. In the table below, check the pain location, characteristic symptoms, and context of occurrence together.
| Disease | Mainly Painful Location | Characteristic Symptoms | Context of Occurrence |
|---|---|---|---|
| Deltoid ligament injury | Front and below inner malleolus | Pain on palpation, feeling of ankle instability | Sports involving severe foot twisting, accumulated repetitive impact |
| Posterior tibial tendinitis | Behind inner malleolus | Pain on palpation, worsening after walking or running | Repetitive load-bearing movements like running |
| Tarsal tunnel syndrome | Behind and plantar to inner malleolus | Numbness, burning, sharp shooting pain | Prolonged standing or walking, worse at night |
| Accessory navicular syndrome | About 2cm in front of inner malleolus | Tenderness at prominent area on foot's inner side, flattened foot arch | Congenital bone structure, when compression is repeated |
Let me elaborate on each cause.
Deltoid ligament injury occurs when the deltoid ligament supporting the inner ankle becomes damaged. The deltoid ligament is a sturdy structure composed of two layers (superficial and deep), but it can be injured from accumulated repetitive impact like running or from sports movements involving severe foot twisting.
Posterior tibial tendinitis is characterized by severe pain when pressing behind the inner malleolus, and worsening pain after walking or running. The posterior tibial tendon wraps around the back of the inner malleolus like a pulley and attaches to the foot's arch; when repetitive load accumulates on this pathway, the area around the tendon swells and pain develops.
Tarsal tunnel syndrome is a condition where the tibial nerve passing through a narrow passageway (tarsal tunnel) behind the inner malleolus becomes compressed, causing numbness and pain to radiate toward the plantar aspect. According to the Journal of the Korean Orthopaedic Association, it is a nerve compression disorder with a similar pathogenesis to carpal tunnel syndrome of the wrist, showing numbness spreading to the plantar aspect and toes.
Accessory navicular syndrome occurs when an accessory bone (accessory navicular) that failed to fuse properly at birth remains about 2cm in front of the inner malleolus. The inner side of the foot may appear visibly prominent, and according to clinical data, pain becomes pronounced when this area is subjected to repeated compression.
The key to differentiation is identifying which front, middle, or back portion of the malleolus the pain concentrates on. According to Hidoc (citing press release from Konkuk University Hospital), pain at the front of the malleolus is likely from joint or ligament pathology, pain at the middle malleolus area is likely from stress fracture, and pain at the back of the malleolus is likely from posterior tibialis tendon pathology. Subdividing and examining the pain location is key to differentiation.
If the outer malleolus (lateral malleolus) hurts — 3 main causes
Outer malleolus pain is caused by lateral ligament, peroneal tendon, and subcutaneous bursa—the lateral ankle structures—each presenting different problems.
① Ankle sprain (lateral ligament injury) is the most common cause of outer malleolus pain. According to Konkuk University Hospital press release, when you suddenly twist the ankle or experience a twisting injury, or when repetitive minor trauma accumulates, the lateral ligament becomes damaged. Pain directly below the outer malleolus on palpation and worsening pain when turning the ankle inward are characteristic.
② Peroneal tendinitis develops from repetitive movements like running or tennis, or from inversion injury where the ankle twists outward. According to the same source, severe pain and swelling typically appear on the outer ankle and behind the malleolus, with pain worsening when turning the foot outward.
③ Malleolar subcutaneous bursa inflammation occurs after prolonged wearing of shoes that continuously compress the malleolus area, such as ice skates or hiking boots. According to Hidoc, the most common symptom is soft, painless swelling of the outer malleolus area; in some cases, redness and swelling accompanied by pain may develop.
At Gangbuk Anjeong Korean Medicine Clinic, we carefully examine ligaments, tendons, and nerve areas around the ankle malleolus and use high-concentration bee venom acupuncture without steroid components and blood stasis acupuncture to approach the inflamed area. Following the one-week prescription principle, we check recovery progress weekly and adjust herbal medicine prescriptions accordingly.
⚠️ The possibility of procedure side effects may vary depending on individual skin condition.
Is my malleolus pain a signal that I need to go to the hospital right now?
If you check any one of the following, we recommend getting a medical consultation before self-observation.
— You suddenly developed severe pain without any memory of injuring the ankle — Pain is accompanied by numbness or burning sensation spreading to the plantar side and toes — The longer you stand or walk, or at night, the more severe the pain and numbness become — When you lightly tap the inner ankle, you feel numbness radiating toward the plantar aspect — There is a noticeable protrusion on the inner side of the foot and the surrounding area often hurts — You are repeatedly experiencing frequent ankle twists — The malleolus area is swollen with heat sensation — Walking has become noticeably inconvenient due to pain
According to clinical data, even without trauma, sudden severe pain, numbness, gait difficulty, and other symptoms may be due to causes other than simple sprain, such as nerve compression, tendon injury, or fracture. Therefore, relying only on self-treatment is not recommended. In particular, numbness spreading to the plantar aspect when tapping the inner ankle is known to be a signal requiring tarsal tunnel syndrome differentiation. Additionally, clinical cases report that when an accessory navicular is present, the muscles supporting the foot's arch accumulate stress, potentially leading to plantar fasciitis or recurrent sprains in a vicious cycle.
Residents of nearby areas searching for Korean medicine clinic in Suyu area, ankle pain in Mia, and ankle sprain in Bundong can also visit. If ankle malleolus pain persists for more than 2 weeks, worsens at night, or is accompanied by swelling and numbness, please don't judge alone but get a differential diagnosis.
Since malleolus pain causes differ by location, the approach must also differ
Gangbuk Anjeong Korean Medicine Clinic examines ligaments, tendons, and nerve areas around the ankle malleolus by location and plans Korean medicine treatment tailored to the cause. If the throbbing doesn't disappear, please take the first step conveniently by Naver reservation at Gangbuk Anjeong Korean Medicine Clinic near Suyu area, which opens from 8 AM.
Whether inner or outer, front or back—the related structures differ, and an approach suited to those structures guides the direction of recovery. We approach the inflamed area with high-concentration bee venom acupuncture and blood stasis acupuncture, examine ankle alignment and surrounding tissue tension through chuna therapy, and confirm and adjust progress weekly with one-week herbal medicine prescriptions. If ankle malleolus pain is left untreated, it can lead to chronicity. Open 365 days a year with no waiting through Naver reservation, so please get examined before pain becomes familiar.
Malleolus pain, these are the most frequently asked questions
Q1. I've never sprained my ankle, but why does the area around my malleolus keep throbbing?
The area around the malleolus can persistently throb even without trauma. Posterior tibial tendinitis from repetitive movement causing tendon overload, tarsal tunnel syndrome where a nerve gradually becomes compressed, or degenerative changes in the joint can all be causes. Just because there's no memory of trauma doesn't mean you should dismiss it as simple fatigue—if it persists for more than 2 weeks, we recommend getting a medical consultation.
Q2. The back of my inner malleolus particularly hurts and my plantar aspect is numb. What disease is this?
If pain behind the inner malleolus is accompanied by plantar numbness, tarsal tunnel syndrome (ankle tunnel syndrome) must be considered. When the tibial nerve passing through a narrow passageway on the inner ankle becomes compressed, numbness and burning sensation spread to the plantar surface and toes, with symptoms characteristically worsening with prolonged standing or walking and at night. If light tapping of the inner ankle causes numbness to spread, suspicion increases.
Q3. I have outer malleolus pain, but walking isn't too inconvenient. Do I still need treatment?
Even if walking isn't significantly inconvenient, we don't recommend leaving it untreated. Lateral ligament microtrauma or subcutaneous bursa inflammation often show little to no gait disturbance in early stages, but as repetitive load accumulates, ligament instability can worsen or progress to chronic pain. Even if there's mild discomfort, it's advisable to have it examined early if it persists for more than 2 weeks.
Q4. Does Korean medicine treatment help with malleolus pain? What methods are used?
Since the causes of ankle malleolus area pain differ according to ligaments, tendons, and nerves, Korean medicine also approaches based on location. We access inflamed areas with high-concentration bee venom acupuncture without steroid components, relieve sudden muscle tension and blood stasis with blood stasis acupuncture, and examine ankle alignment and tissue tension through chuna therapy. With one-week herbal medicine prescriptions, we confirm recovery progress weekly and adjust prescriptions accordingly.
⚠️ The possibility of procedure side effects may vary depending on individual skin condition.