Differential Diagnosis for Pain on the Interior Side of Foot
Single Most Likely Diagnosis
- Plantar Fasciitis: This condition is the most common cause of pain on the bottom of the foot, including the interior side. It occurs due to inflammation of the plantar fascia, a band of tissue that supports the arch of the foot. The pain is typically worse in the morning and after periods of rest.
Other Likely Diagnoses
- Overuse or Strain of the Foot Muscles: Repetitive activities or sudden increases in physical activity can lead to strain or overuse of the muscles on the interior side of the foot, causing pain.
- Posterior Tibial Tendinitis: Inflammation of the posterior tibial tendon, which runs along the interior side of the foot, can cause pain in this area, especially with activities that involve pushing off the ground.
- Morton's Neuroma: Although more commonly associated with pain between the toes, Morton's neuroma (a thickening of nerve tissue) can sometimes cause pain on the interior side of the foot if the affected nerve is located in this area.
Do Not Miss Diagnoses
- Deep Vein Thrombosis (DVT): While less common, DVT can cause pain in the foot, including the interior side, and is a potentially life-threatening condition if not treated promptly.
- Osteomyelitis or Septic Arthritis: Infections of the bone or joint can cause severe pain and require immediate medical attention to prevent serious complications.
- Compartment Syndrome: This is a condition where pressure within the muscles builds to dangerous levels, cutting off blood flow. It can cause severe pain and requires emergency treatment.
Rare Diagnoses
- Tarsal Tunnel Syndrome: Similar to carpal tunnel syndrome in the wrist, tarsal tunnel syndrome involves compression of a nerve in the foot, which can cause pain, numbness, and tingling on the interior side of the foot.
- Stress Fractures: Small cracks in the bones of the foot can cause pain, especially with weight-bearing activities. While not exclusively located on the interior side, they can occur in this area.
- Arthritis: Various forms of arthritis, such as rheumatoid arthritis or psoriatic arthritis, can cause pain in the foot, including the interior side, though this is less common than other locations.