Wow Well I Have Never Done The Chat, But My

wow
well I have never done the chat, but my left hand; between thumb and forefinger near the life line. It is feels like tender has been pulled it hurts to grab something. this pain started last Friday. I work out 5 days a week and have not done any other unusual routines.
it is more pronounced pain when I left - a shoulder press, but the pain is in the middle of the hand... what type of doc should I visit regarding hands? thanks again