Heliotherapy, which is the medical use of sunlight to treat various diseases, has many synonyms. Some of the most common ones include photosynthesis, phototherapy, sun therapy, solar healing, light therapy, and sunshine treatment. Other synonyms for heliotherapy include sunbathing, natural light therapy, and exposure therapy. Many alternative medicine practitioners also use the term solar treatment or solar healing to describe the use of sunlight to treat various ailments or conditions. Regardless of the specific term used to describe this therapeutic approach, the benefits of heliotherapy are well-documented and include improved mood, increased vitamin D production, and improved skin health. Overall, heliotherapy is a simple and effective way to promote healing and overall wellness in people of all ages.