There are many daily causes of pain in the left big toe joint, the most common of which are bacterial infection, arthritis, bunion deformity, external factors and so on, as follows: a. Bacterial infection: the presence of bacterial infection in the left big toe joint will lead to significant local pain, swelling, and increased skin temperature and local redness. Arthritis: The presence of gouty arthritis, osteoarthritis, rheumatoid arthritis, and rheumatoid arthritis can also cause significant pain in the left big toe joint. Bunion deformity: If the patient has a bunion deformity, it will also lead to significant pain symptoms in the left big toe joint. External factors: Local external forces that cause joint capsule damage, dislocation, and fractures can also lead to significant pain in the left big toe joint.