Wild Lettuce Benefits and Uses Wild Lettuce: Wild lettuce is a plant. The leaves, sap (latex), and seed are used to make medicine. Wild lettuce is used for whooping cough, asthma, urinary tract problems, cough, trouble sleeping (insomnia), restlessness, excitability in children, painful menstrual periods, excessive sex drive in women (nymphomania), muscular or joint pains, […]