Upper left foot tendon pain may be related to trauma, fasciitis, lumbar spine disease and other causes, which need to be differentiated and diagnosed by a doctor. 1. Trauma: If the left foot suffers from sprains and other traumatic injuries, it may cause damage to the soft tissues of the left foot, resulting in symptoms of tendon pain. 2. Fasciitis: The amount of walking you do on a regular basis may cause aseptic inflammation of the left foot, leading to tendon pain. 3. Lumbar spine disease: If the lumbar disc is herniated, tendon pain may occur because the nerve root innervating the left foot is compressed. It is recommended that people with upper left foot tendon pain go to a regular hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor, so as not to delay the disease and bring adverse effects to the body.