Persistent numbness and pain five months after surgery suggest potential nerve irritation or compression (such as the radial or median nerve) or scar tissue buildup. For temporary relief of the upper arm pain, over-the-counter anti-inflammatories like Ibuprofen or Acetaminophen can help. However, for nerve-related numbness, prescription medications like Gabapentin, Pregabalin, or Vitamin B12 supplements are often used to promote nerve healing. Please do not self-medicate. It is crucial to consult your orthopaedic surgeon or a neurologist. They may recommend a nerve conduction study (EMG) to identify the exact cause and prescribe the correct targeted treatment.