Differential Diagnosis for Left Foot Pain
Single Most Likely Diagnosis
- Plantar fasciitis: This is a common condition characterized by inflammation of the plantar fascia, leading to pain in the heel and bottom of the foot. The chronic nature of the pain (over 2 years) with recent worsening is consistent with this diagnosis, as plantar fasciitis can have a prolonged course with periods of exacerbation.
Other Likely Diagnoses
- Morton's neuroma: A condition where a nerve in the foot becomes irritated or compressed, leading to pain, typically between the toes. The pain can radiate to other parts of the foot, making it a plausible diagnosis for foot pain without discoloration.
- Tendinitis: Inflammation of the tendons in the foot can cause pain, especially if the tendons are overused or strained. Given the duration and recent worsening of the pain, tendinitis is a possible diagnosis.
- Bursitis: Inflammation of the bursae (fluid-filled sacs that cushion bones, tendons, and muscles near joints) in the foot can cause pain and swelling, although the absence of discoloration might make this less likely.
Do Not Miss Diagnoses
- Deep vein thrombosis (DVT): Although less common in the foot, DVT can cause pain and swelling, typically without discoloration in the early stages. It's crucial to consider this diagnosis due to its potential for severe complications, such as pulmonary embolism.
- Osteomyelitis: An infection of the bone that can cause pain, which may not always be accompanied by obvious signs of infection like discoloration, especially in the early stages.
- Peripheral artery disease (PAD): Reduced blood flow to the limbs can cause pain, especially during activity, and is a critical diagnosis not to miss due to its implications for cardiovascular health.
Rare Diagnoses
- Erythromelalgia: A rare disorder characterized by burning pain, heat, and redness in the hands and feet. Although it typically presents with discoloration, variations in presentation could make it a consideration in some cases.
- Complex regional pain syndrome (CRPS): A condition characterized by persistent burning pain and inflammation after an injury, which can occur in the foot. It's rare and might not always present with the typical signs of discoloration or swelling.
- Gout or pseudogout: These conditions involve sudden, severe attacks of pain, swelling, redness, and tenderness, most often in the big toe. However, they can occur in other parts of the foot and might not always present with discoloration, especially in the early stages or in atypical cases.