Risk: High

Starting a cold therapy and thermal contrast optimization side hustle from scratch can involve financial risks due to equipment costs, time investment in learning and practice, energy spent on building clientele, and potential setbacks to confidence if results are slow to materialize. Beginners may invest in equipment and education without seeing immediate returns, especially if marketing efforts are not effective. Startup costs for equipment and training could be significant and might not pay off right away. Online discussions mention cases of individuals failing to generate profits or losing money when starting in this niche.