Pain on the lateral side of the left foot is a common symptom, the reasons are as follows: 1, it may be caused by trauma, such as strain on the muscles and ligaments of the foot caused by strenuous activity, there may be symptoms of pain on the lateral side of the left foot; 2, it may be caused by osteophytes, patients suffering from osteophytes long-term exertion can cause aseptic inflammation of the joints, there may be symptoms of pain in the foot; 3, it may be suffering from Gouty arthritis, patients suffering from gout who consume too much food with high purine content, such as seafood, spinach, beer, etc., can lead to an increase in blood uric acid levels, thus inducing gouty arthritis, and patients can experience redness, swelling, heat and pain in the joints of the feet. Patients should pay attention to rest, not to carry out strenuous sports, can take oral anti-inflammatory painkillers to relieve symptoms, if the pain symptoms can not be relieved, but also need to go to the hospital for further examination, to clarify the cause and according to the cause of targeted treatment.