Lymphatic drainage is the process by which lymphatic vessels collect and transport excess interstitial fluid, proteins, and waste products from tissues back into the bloodstream, maintaining fluid balance and immune surveillance. It is crucial in clinical practice for understanding oedema formation, immune response, and the spread of infections or malignancies. Impaired lymphatic drainage can lead to lymphedema, a chronic and often debilitating swelling commonly seen after lymph node removal or damage.