Big toe pain on the left foot may be caused by physiological reasons such as excessive exercise and too small shoes, or it may be caused by pathological factors such as infection and gout. 1. Physiological reasons: usually, everyone’s left and right feet are not the same size, if the big toe of the left foot is wider and the shoes are smaller, in the process of walking or exercise, it may cause repeated friction or impact between the big toe of the left foot and the shoes, resulting in pain. In addition, too much exercise may cause local soft tissue fatigue, and the above symptoms may also occur. 2. Pathological factors: the toe area is in the end of the body, the circulation is poor; at the same time, because of long-term shoes in a relatively anoxic environment, anaerobic bacteria infection may occur, resulting in left big toe pain symptoms, such as onychomycosis, etc.; the existence of the underlying gout disease patients, may also occur in the left big toe area of the accumulation of the above symptoms. If the symptoms of left foot big toe pain are not relieved, or accompanied by other symptoms, patients should go to the hospital in time to consult the doctor, and give targeted treatment after clarifying the cause.