Hi,Thanks for your query. After going through your query I came to know that your thumb pulses with my heart beat. You have no other symptoms .I think you need not to worry , you does not require any treatment. As a precautionary measure you can get your MRI of hand done to discover a disease. You can discuss with your treating Doctor about it. I do hope that you have found something helpful. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries. Wishing you good health. Take care.