What Can Cause Weakness On Left Side Of The Body?

Hello, For the past two weeks I ve been having weakness on the left side of my body. Mainly my left arm but I still feel general weakness on my left side and after a hard workout my left leg has given out a few times because the muscles are just so weak. I m a very active 22 year old female on no medication and have no serious health problems that I m aware of. Just wondering if I should go get checked or what my options are. Thanks!