The maxillary sinus, the largest of the paranasal sinuses, plays a crucial role in dental implantology. Tooth loss in the posterior maxilla often results in alveolar bone resorption and sinus expansion, reducing available bone for implant placement. The sinus lift procedure is a regenerative technique designed to increase bone volume and facilitate implant placement. It can be performed using a one-stage (simultaneous implant placement) or two-stage (delayed implant placement) approach, depending on residual bone height. This thesis analyzes common complications of sinus lift procedures, their clinical manifestations, and management strategies. As dental implants gain popularity over removable dentures, understanding these complications is essential for improving surgical outcomes. A comprehensive literature review was conducted using PubMed, Google Scholar, and Science Direct, focusing on studies published since 1980. Topics included sinus lift techniques, graft materials, and complication management. The two main surgical techniques used are: Lateral window approach (A window is created in the lateral maxillary wall to elevate the Schneiderian membrane and insert graft material), Transcrestal (osteotome) approach (A less invasive method accessing the sinus through the alveolar crest). Innovative methods like balloon and water-assisted sinus lifts aim to reduce surgical trauma and membrane perforation. Common complications include: Schneiderian membrane perforation (20-25%_ Managed with collagen membranes), Hemorrhage (Controlled with hemostatic agents), Infraorbital nerve damage (Minimized with careful planning), Infection (Prevented with antibiotics; severe cases may require drainage), Oroantral fistula (May need surgical closure), Chronic rhino sinusitis (Treated with corticosteroids or surgery). Post-surgical follow-up: Healing takes 6-9 months, requiring patients to avoid activities that increase sinus pressure. Regular follow-ups ensure graft integration and monitor complications. The sinus lift is a well-established procedure that enhances implant success in the posterior maxilla. While complications exist, careful planning, proper technique selection, and post-operative care can improve patient outcomes and reduce risks. This thesis provides insights into sinus lift challenges and management, contributing to better clinical practices in implant dentistry.