Biochemistry is one of the fundamental sciences that contributes to understanding the chemical and biological processes occurring within the human body. It studies the components of cells and tissues and the reactions that maintain normal bodily functions. This field is highly important in medicine because it provides a scientific basis for understanding the causes of diseases and the mechanisms underlying their development. Biochemistry contributes to studying the changes that occur in the body as a result of disease through the analysis of blood components, enzymes, proteins, hormones, and various biomarkers. These analyses help detect abnormalities in the functions of body organs and assess a patient’s health condition. Biomarkers also play an important role in diagnosis and monitoring, as changes in the levels of certain substances in the body may indicate the presence of a medical condition or the progression of a disease. This information helps physicians make more accurate decisions regarding diagnosis and treatment. Biochemistry also intersects with many modern medical fields, including genetics, molecular medicine, and pharmacology. This contributes to understanding the relationship between molecular changes and the development of diseases. Studying drug mechanisms and biochemical interactions also supports the development of more effective and safer treatments. With the continuous advancement of laboratory analysis technologies, biological samples can now be examined with a high degree of accuracy, while large amounts of information related to biological processes within the body can be analyzed. This contributes to improving early diagnosis, monitoring disease progression, and evaluating responses to treatment. Accordingly, biochemistry represents an essential link between basic sciences and medical practice. It contributes to explaining the changes that occur within the body and understanding disease mechanisms, while supporting the development of diagnostic and therapeutic approaches and enhancing the quality of healthcare and medical research.