Hi there I am Dr Mittal. I will try to help you and explain you the condition. First, there is always a possibility of the ulnar nerve entrapment. There might be a problem like tennis elbow. Here the muscle in the elbow is hurt, and the nerve below it may hurt. So if you are lifting heavy weights, there may be a problem and cause pain and tingling and numbness of the arm. Second there is a possibility that the condition is due to the possibility of a radiculopathy. The radiculopathy is due to a pain in the neck. There may not always be a pain in the neck. But the space between the vertebra may have reduced or calcified causing problem in the nerve, There is increased pressure in the nerve tissue causing tingling and numbness Third there may be some infection or inflammation in the path of the nerves. This may be irritating the nerve causing the symptoms, especially since you have the symptoms when at rest. I am sorry, but a detailed examination may be needed to deifferentiate between these causes I would suggest the following tests 1. NCV of the affected arm 2. Complete hemogram 3. Vitamin B12 and Folate 4. X ray cervical spine (MRI is a better test) 5. Sugars 6. Thyroid test I hope this helps you. Inform the reports mentioned above so i can be of help further. Best of luck. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. Please do understand that some details could be extracted from a detailed history and examination. Looking forward to your return query with the details asked so that I can help you further. (If the answer has helped you, please indicate this)