Foot Health Encyclopedia
Understanding common foot problems to protect your foot health
Early detection, prevention, and treatment are key to protecting foot health
1. High Arch
Abnormally high foot arch
📖What is it
High arch (cavus foot) refers to an abnormally elevated arch on the inside of the foot, reducing contact area with the ground. While normal arches support body weight like a bridge, high arches make feet overly rigid, lacking proper shock absorption.
🔍Main Symptoms
- •Obvious gap in mid-foot, barely touching the ground
- •Excessive pressure on heel and forefoot
- •Foot pain after prolonged standing or walking
- •Prone to calluses and corns on soles
- •Frequent ankle sprains
⚠️Long-term Impact
- •Plantar fasciitis: Uneven pressure causes excessive fascial stretching
- •Stress fractures: Forefoot and heel bones bear excessive impact
- •Knee pain: Insufficient foot cushioning transfers to knees
- •Ankle instability: Prone to recurrent sprains
- •Calf muscle fatigue: Over-compensation causes muscle tension
✅Solution
Custom insoles fill the arch gap, evenly distribute plantar pressure, provide extra shock absorption, reduce heel and forefoot burden, and prevent sports injuries.
2. Low Arch
Low but not completely collapsed arch
📖What is it
Low arch is a condition between normal arch and flat feet, where the medial arch is lower but retains some support. This foot type shows further arch降低 under weight-bearing and may develop into flat feet long-term.
🔍Main Symptoms
- •Noticeable arch lowering when standing
- •Foot soreness after prolonged walking
- •Inner foot easily fatigues
- •Shoes wear faster on inside
- •Foot swelling in afternoon or after exercise
⚠️Long-term Impact
- •Progressive arch collapse: May develop into complete flat feet
- •Plantar fascia strain: Prolonged excessive stretching
- •Knee valgus: Foot instability affects knee alignment
- •Lower back pain: Gait changes affect spinal mechanics
- •Decreased athletic ability: Lack of sufficient elasticity and explosive power
✅Solution
Custom insoles provide progressive arch support, prevent further collapse, improve foot mechanics, train plantar muscles, and delay or avoid developing flat feet.
3. Flat Feet
Complete or near-complete arch loss
📖What is it
Flat feet (pes planus) is when the medial longitudinal arch is completely or nearly completely absent, with almost the entire sole contacting the ground. Can be congenital or acquired, severely affecting foot support and cushioning.
🔍Main Symptoms
- •Entire sole touches ground when standing, no visible arch
- •Feet roll inward when walking (overpronation)
- •Feet tire easily, cannot stand long
- •Shoes severely wear and deform on inside
- •Frequent calf and ankle soreness
⚠️Long-term Impact
- •Severe plantar fasciitis: Continuous excessive fascial stretching
- •Knee degeneration: Abnormal gait accelerates joint wear
- •Achilles tendinitis: Changed foot mechanics increase tendon burden
- •Hip problems: Mechanical chain transfers to hips
- •Spinal scoliosis: Long-term poor gait affects spine
- •Severely limited movement: Running and jumping ability significantly decreased
✅Solution
Requires functional custom insoles to provide strong arch support, rebuild foot mechanics, combined with foot muscle training, improve gait, reduce joint burden, and restore athletic ability.
4. Ankle Instability
Decreased ankle joint stability
📖What is it
Ankle instability occurs when ligaments around the ankle are lax or damaged, reducing joint stability. Common after repeated sprains, ligaments lose original tension and support, making ankles prone to reinjury.
🔍Main Symptoms
- •Ankle feels unstable when walking
- •Easy to sprain on slightly uneven surfaces
- •Ankle area frequently feels weak
- •Need extra attention to footing during sports
- •Repeated sprains with longer recovery times
⚠️Long-term Impact
- •Chronic sprains: Forms vicious cycle
- •Cartilage damage: Repeated sprains wear joint cartilage
- •Traumatic arthritis: Long-term instability causes inflammation
- •Decreased proprioception: Balance ability continuously deteriorates
- •Limited activity: Afraid to run or jump
- •Bone spur formation: Joint instability stimulates bone growth
✅Solution
Custom insoles stabilize the foot and provide additional lateral support to reduce abnormal ankle movement, combined with ankle rehabilitation training to strengthen surrounding muscles and prevent reinjury.
5. Arch Collapse
Loss of arch structure support
📖What is it
Arch collapse is a progressive condition where a previously normal arch gradually降低s or disappears due to prolonged pressure, muscle weakness, or ligament laxity. Without timely intervention, it develops into permanent flat feet.
🔍Main Symptoms
- •Gradual降低ing of arch height
- •Foot noticeably flattens after prolonged standing
- •Persistent pain or aching on inner foot
- •Tight plantar fascia, heel pain when getting out of bed
- •Changed gait, feet rotate inward when walking
⚠️Long-term Impact
- •Plantar fasciitis: Excessive fascial stretch causes inflammation
- •Posterior tibial tendinitis: Arch-supporting tendon strain
- •Medial knee pain: Mechanical changes affect knee
- •Heel spurs: Long-term abnormal pressure stimulates bone growth
- •Abnormal gait: Affects whole-body skeletal alignment
- •Irreversible deformity: Delayed treatment leads to permanent flat feet
✅Solution
Early intervention is crucial! Custom insoles provide precise arch support, halt collapse progression, combined with foot muscle strengthening, can partially restore arch function and prevent further deterioration.
6. Plantar Fasciitis
Chronic inflammation of plantar fascia
📖What is it
Plantar fasciitis is chronic inflammation caused by prolonged overstretching or repeated micro-tears of the plantar fascia. The plantar fascia is strong fibrous tissue connecting heel to toes, supporting the arch and absorbing walking impact.
🔍Main Symptoms
- •Sharp heel pain with first step in morning (characteristic symptom)
- •Plantar pain when standing after sitting
- •Pain intensifies after prolonged walking or standing
- •Obvious tender point when pressing inner heel
- •Pain somewhat relieves after activity but worsens with overuse
⚠️Long-term Impact
- •Chronic pain: Affects daily life and work
- •Heel spurs: Long-term inflammation stimulates bone growth
- •Gait changes: Altering walking posture to avoid pain
- •Knee and back pain: Abnormal gait causes knee and lower back compensation
- •Plantar fascia rupture: May completely tear when severe
- •Loss of mobility: Unable to walk normally when pain is severe
✅Solution
Custom insoles provide precise arch support, reduce plantar fascia tension and pressure, combined with stretching exercises and anti-inflammatory treatment, effectively relieve pain, promote healing, and prevent recurrence.
7. Bunion (Hallux Valgus)
Big toe deviates outward
📖What is it
Bunion is when the big toe deviates toward the second toe and the first metatarsal shifts inward, causing the first metatarsophalangeal joint to protrude, forming a 'bunion.' May be caused by genetics, pointed shoes, or abnormal foot mechanics.
🔍Main Symptoms
- •Big toe obviously deviates outward
- •First metatarsophalangeal joint protrudes, forming hard bump
- •Protruding area red, swollen, painful, rubs in shoes
- •Second and third toes compressed and deformed (hammer toes)
- •Forefoot widens, difficult to find suitable shoes
⚠️Long-term Impact
- •Persistent pain: Protruding joint repeatedly inflames
- •Arthritis: Joint misalignment causes degenerative changes
- •Other toe deformities: Second and third toes compressed
- •Abnormal forefoot weight-bearing: Causes metatarsalgia
- •Decreased balance: Changed foot support surface
- •Surgery required: Severe deformity only correctable by surgery
- •Affects appearance: Embarrassed to wear sandals in summer
✅Solution
Early mild bunions can be corrected with custom insoles to adjust foot mechanics and slow progression. Insoles adjust forefoot pressure distribution; combined with toe separators and avoiding pointed high heels, can prevent worsening. Severe cases require surgery.