Hello, Thanks for your query. According to symptoms it looks like there is compression of nerve in cervical [neck area] spine. This leads to numbness and pain in his shoulder and hand. Most probable reason for his symptoms could be postural problem . He may need to take x ray spine to see for severity of nerve compression. Some medication like methylcobalamine with muscle relaxant and analgesic will help, you can take them consulting your treating doctor. Some exercises which can be done after pain has reduced include- gradual neck rotation, touching your ears to shoulder, shoulder shrugging exercises. He may consult physiotherapist for further guidance. He may start INTERFERENCE THERAPY, ULTRASONIC THERAPY, which are helpful in his case. I do hope that you have found something helpful and I will be glad to answer any further query. Take care