If a patient has pain on the lateral side of the big toe, the causes include bunion deformity, bunions, lumbar disc herniation, and injury, etc., as follows: I. Bunion deformity: Bunion deformity can easily lead to painful symptoms on the lateral side of the patient’s big toe. Bunions: Bunions can easily lead to pain on the outside of the big toe. Third, lumbar disc herniation: Patients with lumbar disc herniation, especially after lumbar 5 sacral 1 disc herniation, will also have pain on the outside of the big toe. Fourth, injury: injury to the lateral side of the big toe can also easily cause painful symptoms on the lateral side of the big toe. After a patient has pain on the outside of the big toe, it is important to seek medical attention to see what is causing it and treat the cause to promote pain reduction and recovery. Patients with significant pain should avoid standing for long periods of time and avoid squatting, running and jumping, and hiking to avoid aggravating the pain.