List of adult symptoms

Foot:

Flat feet (or flat arches) - Flat feet or flat or fallen arches gives this symptom its common name.
Bunions - Various deformities of the big toe joint where the big toe points toward the second toe. May cause limited joint function.
Hammertoes - Abnormal tendon pull of the toes can cause a deformity, making one or more take on a hammer-like appearance.
Ingrown toenails - Resulting as a consequence of excessive toe motion due to abnormal foot movement.
Morton's neuroma - Caused by abnormal trauma to the intermetatarsal nerves.
Plantar fasciitis/Heel Spur Syndrome - Flattening of the arch leads to chronic over-stretching of the plantar fascia. The chronic pulling of the ligament on the calcaneus (heel bone) the bone will try to "grow-out" a shelf of bone to decrease the pull on the ligament. If the bone doesn't "grow-out" enough, symptoms will arise.
"Pump-bumps" or Haglund's Deformity - Bone spurs on the back of the heel due to abnormal pull of the Achilles tendon.
Uneven shoe wear - Due to the abnormal foot motion shoes will be worn unevenly, especially in the heel area.

Ankle:

Tarsal Tunnel Syndrome - Nerve dysfunction in the inner ankle area due to chronic overstretching and impingement of the nerve.
Posterior tibial tendon dysfunction - Again, due to the flattening of the arch and repeated overstretching and activity on the pull of this tendon, inflammation develops leading to chronic inflammation and disease of the tendon.
Chronic ankle sprains - From the excessive rear-foot motion overstretching of the ligaments leads to weakness, and if there is a sudden twisting of the ankle the ligaments are unable to prevent that excess motion leading to further injury.

Leg:

Shin splints/cramping - Adult "growing-pains" occur during/after exercise due to overactivity of the leg muscles to propel the foot.
"Restless Leg Syndrome" - Occurs at night, due to overactivity during the day.

Knee:

Anterior/Posterior Cruciate Ligament Dysfunction
Iliotibial Band Syndrome
Lateral & Medial Collateral Ligament Dysfunction
Meniscus cartilage damage
Patellar tendinitis
Osteoarthritis

Hip:

Sciatica - Impingement of the large nerve from abnormal soft tissue adaptations.
Joint degeneration - Due to chronic inflammation from abnormal joint motion

Pelvis:

Pelvic tilt - Compensation from abnormal hip motion that leads to abnormal back motion.
Leg length discrepancy

Back:

Disc herniation/degeneration
Spinal stenosis
Scoliosis
Back pain

Neck:

Strain/stiffness

Head:

Migraines
TMJ