Peroneal Tendinitis in Singapore: Outer Ankle Pain

Written & reviewed by the BestDoctors.sg editorial team · Last updated 24 Aug 2026 · General information, not medical advice

An inability to bear weight, a sudden “pop” or the ankle giving way, marked swelling or deformity, or a cold, pale or numb foot after injury needs prompt or emergency care — call 995 for the serious signs.

What causes it

The most common cause is overuse — running, dancing, hiking, court and jumping sports, or a sudden increase in training. Previous ankle sprains are a frequent precursor, because repeated rolling of the ankle overloads the peroneal tendons, which are its stabilisers, and chronic ankle instability often goes hand in hand. High-arched (cavus) feet place extra stress on these outer-ankle tendons and are a recognised risk factor, as are worn or unsupportive footwear, hard surfaces, tight calf muscles, and gait abnormalities. Older age, being overweight, smoking and inflammatory or metabolic conditions are also reported contributors.

Symptoms

The typical picture is pain, swelling and tenderness on the outside of the ankle and foot, along the course of the tendons behind and below the outer ankle bone. Pain worsens with activity and eases with rest, the area may feel warm or thickened, and there is often a feeling that the ankle is unstable or may give way, with difficulty on uneven ground. Snapping, popping or clicking at the outer ankle can suggest the tendons are slipping out of their groove, and a sudden sharp pain may indicate a tear.

Red flags

Seek prompt care for an inability to bear weight or walk after an injury; sudden severe pain, a “pop,” or the ankle giving way (possible tendon tear or dislocation); marked swelling, bruising or deformity, or an ankle that looks out of shape (to exclude a fracture); recurrent snapping with instability; or signs of infection. A cold, pale or numb foot after injury is an emergency. Persistent outer-ankle pain that does not settle should be reviewed, as untreated tendon problems can progress to tearing.

How it is assessed and treated

Assessment involves pinpointing tenderness over the tendons, testing strength when turning the foot outward against resistance, checking for tendon snapping and ankle instability, and assessing foot shape. An X-ray excludes a fracture, and ultrasound (which can show the tendons slipping in real time) or MRI details inflammation or tears. Peroneal problems are easy to miss and are sometimes mistaken for a simple sprain, so specialist review helps. A podiatrist, sports physician or foot-and-ankle orthopaedic surgeon may treat it, with physiotherapists central to rehabilitation. Treatment is conservative first: rest and activity modification, with rest, ice, compression and elevation in the early painful phase; short-course pain relief; and immobilisation in a brace, support or walking boot for more painful cases. Physiotherapy is the mainstay — progressive strengthening of the ankle stabilisers, calf stretching, balance work to address any underlying instability, and a graded return to loading. Supportive footwear and orthotics help, especially for high arches. Steroid injections are used cautiously because of rupture risk, and surgery is reserved for tears, recurrent slipping, or cases that fail sustained conservative care. Most tendinitis improves over several weeks, and a graded, physio-guided return prevents relapse.

Returning to sport without relapse

The commonest reason peroneal tendinitis drags on is returning to full activity too soon, so a graded, guided comeback is worth the patience. Complete the rehabilitation rather than stopping when the pain eases: keep strengthening the ankle stabilisers and doing balance work until the ankle feels genuinely steady, because any underlying instability that is left unaddressed keeps overloading the tendons. Supportive footwear, and an orthotic for a high-arched foot, reduce the strain on the outer ankle, and a proper warm-up before sport prepares the tendons for load. Using pain as a guide — easing back when it flares rather than pushing through — prevents an inflamed tendon from progressing to a tear. A brace or taping during the early return to sport adds support and confidence on uneven ground. Rebuild training volume gradually rather than in sudden jumps, and give the tendon the several weeks it usually needs; rushing the last stage is what most often sends people back to the start. If you have had several ankle sprains, treating the instability behind them — not just the sore tendon — is what finally settles recurring outer-ankle pain for good.

When to see a doctor

See a doctor for outer-ankle pain and swelling that persists beyond a week or two, keeps recurring, or worsens with activity, for repeated ankle sprains or a sense of instability, or for any red flag such as snapping, an inability to weight-bear, or sudden severe pain.

Related foot & ankle topics

• Hammer, claw & mallet toe
• Metatarsalgia (ball-of-foot pain)
• Tarsal tunnel syndrome
• Sever’s disease (children’s heel pain)
• Haglund’s deformity
• Posterior tibial tendon dysfunction
• Plantar fibroma
• Chronic ankle instability
• Corns & calluses
• Plantar fasciitis
• Ankle sprains
• Orthopaedic (foot & ankle) surgeons
• Ankle Sprain Treatment in Singapore

Sources

• Cleveland Clinic — Peroneal Tendonitis: clevelandclinic.org
• FootCareMD (AOFAS) — Peroneal Tendinosis: footcaremd.org
• SingHealth — Acute Ankle Sprain: singhealth.com.sg
• StatPearls (NCBI) — Peroneal Tendon Syndromes: ncbi.nlm.nih.gov