In 1763, Reverend Edmund Stone took the first step toward the discovery of one of the most commonly used medicines when he noted that the bark of the English willow was an effective treatment for patients suffering from a fever. This synthesised compound would eventually become known as one of the most prescribed drugs for acute and chronic pain symptoms. However, through years of trial and error, this drug has been the subject of many controversial issues. Aspirin serves as one of the leading agents for cardiovascular treatment in women. However, many patients have experienced negative side effects of internal bleeding and lining damage due to strong amounts of acid in the drug. Aspirin is often effective when taken in small doses. This book presents medical and biological research. These involve neurological effects, clinical and experimental reactions, lung exposure, withdrawal symptoms, cardiovascular side effects, uses in cancer treatment and many other application areas.