Breast cancer treatment is multidisciplinary including surgical, hormonal therapy, targeted drug therapy, radiotherapy, chemotherapy and immunotherapy. Modified Radical Mastectomy (MRM) is a procedure in which the entire breast is removed including the skin, nipple, areola and most axillary lymph nodes, except the pectoralis major muscle which is spared. Most common complication in patients undergoing modified radical mastectomy is pain. In 2020 definition of pain has been revised by International Association for Study of Pain (IASP) as “an unpleasant sensory and emotional experience associated with or resembling that associated with actual or potential tissue damage”. Post MRM pain can be Axillary, chest, shoulder and arm pain, which if left untreated can turn into chronic pain. This is described as post mastectomy pain syndrome (PMPS). Persistent pain in post operative period affects 20-50% of mastectomy patients which in turn affects quality of life of the patient thereafter. Pathophysiology of pain is mainly unrelieved inflammation. Reducing post operative pain can improve the quality of life for which different pain modalities can be used including intravenous (iv) opioids, non-steroidal anti inflammatory drugs (NSAIDS), antiepileptics, antidepressants, blocks. Regional nerve blocks show good efficacy in pain management but the availability of ultrasound limits the use of blocks. Opioid induced hyperalgesia is a sensitisation process whereby opioids, paradoxically causes increased pain sensitivity. In recent advances for multimodal analgesia, opioid free analgesia is produced to avoid opioid related side effects. Non opioid analgesics include NSAIDS, Selective Serotonin reuptake inhibitors, Tricyclic antidepressants, Salicylates, etc .Transdermal drug delivery system is painless method of delivering drugs systematically by applying a drug formulation onto intact and healthy skin. The drug initially penetrates through the stratum corneum and then passes through the deeper epidermis and dermis without drug accumulation in the dermal layer. When drug reaches the dermal layer, it becomes available for systemic absorption via the dermal microcirculation. This route has many advantages including non invasiveness, ease of access and the pharmacokinetics of the drug is more uniform, thus minimizing the risk of toxic side effects. Transdermal drugs bypass the first-pass metabolism of the liver, protecting it from damage 

By the end of study we will be able to find out the efficacy of lignocaine patch for post operative pain management in modified radical mastectomy patients.