Hi, Thanks for writing in. One of the most common sensory problems associated with MS is numbness. Numbness occurs when the nerves that transmit sensations do not conduct information properly. As a result, sensations in that particular area are either lacking or nonexistent. Since you are having an active life and still playing tennis twice a week therefore you must get yourself clinically examined and if required a MRI scan. This is necessary as it can pick up any new areas should there be MS specific changes in your brain. Seeing a neurologist is essential at the moment. Please describe completely the symptoms and severity experienced by you.