High environmental temperature or heat stress is a universal problem facing livestock producers, including swine growers. Effects of heat stress can range from minor setbacks in performance to major health consequences, even death losses. Although there are circumstances that may be beyond the control of the producer, with planning and attention to details, there is much the swine producer can do to protect livestock and reduce some of the possible losses. This paper will be focused on heat stress, the effects on swine, recognition of swine distress and potential responses by the producer to lessen the impact.