Plantar Fasciitis: Symptoms, Treatment & Choosing the Right Insoles

How Does Plantar Fasciitis Affect You?

• Heel pain: Typically under the heel, worst with the first steps in the morning or after rest; can be sharp or dull.
• Stiffness: Initial steps after sitting or waking may feel tight and uncomfortable.
• Pain with walking: Hard surfaces can aggravate symptoms. People may alter their gait, which can lead to knee, hip, or back discomfort.
• Reduced activity: Ongoing pain can limit exercise, contribute to weight gain, and reduce fitness.
• Impact on daily life: Standing, walking, and sport may be restricted, reducing quality of life.
• Emotional toll: Persistent pain can increase frustration, anxiety, or low mood.

Severity varies. Many cases improve with conservative care (rest, stretching, orthotic insoles, and physiotherapy). Some severe or persistent cases may require medical interventions such as injections or, rarely, surgery. Always seek assessment from a qualified foot health professional.

How Is It Treated?

• Rest & load modification: Reduce activities that aggravate symptoms (e.g., running, impact sports) while maintaining gentle movement.
• Ice: Apply for 15–20 minutes at a time, several times daily, to help reduce pain and inflammation.
• Stretching exercises: Calf and Achilles stretches (e.g., wall or towel stretch) to reduce tensile load on the plantar fascia.
• Plantar fasciitis insoles: Over-the-counter or custom orthotic insoles provide arch support and heel cushioning to offload the fascia.
• Supportive footwear: Choose shoes with good arch support and cushioning; avoid unsupportive styles such as high heels and thin flip-flops.
• Night splints: Keep the fascia gently stretched overnight to reduce morning pain; modern designs often include soft linings for comfort.
• Physiotherapy/podiatry: Targeted exercises, taping, and gait/biomechanics advice to improve strength, flexibility, and loading patterns.

Treatment should be individualised. Early intervention and consistent adherence to advice generally produce better outcomes.

How to Choose the Correct Insoles for Plantar Fasciitis

1. Arch support: Prefer firm, full-length support to reduce strain on the plantar fascia.
2. Cushioning: Ensure adequate padding—especially under the heel—for shock absorption and comfort.
3. Deep heel cup: Stabilises the rearfoot and supports alignment, decreasing pressure on the fascia.
4. Materials: Durable, supportive options such as EVA, PORON®, or gel blends for longevity and performance.
5. Fit/customisation: Trim-to-fit or custom orthoses tailored to your foot shape and activity needs.

Do Insoles Need Heel Cushioning?

Yes—at least moderate cushioning is recommended. A cushioned heel helps absorb impact, provides a softer landing, and reduces stress on the plantar fascia.

• Shock absorption: Decreases impact forces at heel strike.
• Pain relief: Less pressure on sensitive tissues.
• Support: Complements arch control for better overall alignment.

Do Plantar Fasciitis Insoles Fit All Shoe Types?

Mostly. Many insoles suit athletic, casual, and work footwear, but slim or dress shoes may need thinner devices.

• Sizing & trimming: Choose the correct size and trim where appropriate.
• Removable factory insoles: Shoes with removable liners offer more room and a better fit.
• Check thickness: Thicker insoles may not suit tight or low-volume shoes—consider low-profile options for formal footwear.
• Activity-specific: Pick insoles designed for running, walking, or work boots as needed.

What Insoles Do the NHS Commonly Use?

Across the UK, clinicians frequently use Slimflex insoles for plantar fasciitis because they balance support, customisability, and cost-efficiency.

• Arch support: Strong medial support to offload the fascia.
• Heel control: Deep heel cup and cushioning for stability and shock absorption.
• Customisable: Heat-mouldable and grindable to match patient contours.
• Durable EVA: Built for everyday wear across a wide range of footwear.

Popular models:

• Slimflex Simple: Rapid chairside fitting; deep heel cup and metatarsal raise; fully heat mouldable and grindable.
• Slimflex Comfort: Adds a soft top cover to the Simple’s supportive contour—well suited to highly pronated feet and cases with concurrent Achilles irritation.

What Does the Research Say About Orthotic Insoles?

• Custom vs. prefabricated: Custom orthoses can offer superior short-term relief (≈ up to 12 weeks) for some people; well-designed prefabricated insoles also help many when they provide adequate arch support and heel cushioning.
• Mechanism: Orthoses reduce tensile load on the plantar fascia by supporting the arch, improving pressure distribution, and absorbing shock; features may include rearfoot control and optional metatarsal support.
• Best practice: Guidelines commonly recommend using insoles as part of a broader plan: targeted exercises, weight management where appropriate, and supportive footwear. Proper fitting by a qualified clinician improves outcomes.

Important: This information is for guidance only and is not a substitute for professional medical advice. If heel pain persists or worsens, consult a podiatrist or healthcare professional.