光疗, or light therapy, is a treatment that uses specific wavelengths of light to improve health and well-being. It is commonly used to treat conditions like seasonal affective disorder (SAD), skin issues, and sleep disorders. The therapy can involve exposure to natural sunlight or artificial light sources, such as light boxes or lasers. During 光疗 sessions, patients typically sit in front of a light source for a set amount of time each day. This exposure helps regulate the body's circadian rhythms and can boost mood by increasing serotonin levels. It is considered a safe and effective option for many individuals seeking relief from various ailments.