Arm weakness

Anybody know what this could be? The day before yesterday it my left arm started feeling numb and weak and this has happen to me in the past and it’s gone away so this isn’t new but it came random and idk why and everytime I have it I don’t understand what’s causing it, it feels like a nerve or something in my back cus I don’t get shortness of breath and I feel fine other then my arm feeling weak makes me get scared and I am bloated but that’s about the only thing