Of course it is. No matter how skilled trader you are, (or poker player/or sports expert), you might lose horribly in the short to mid term. No matter how well prepared you are, how much research you do, or good strategy you have, it is still possible the market (cards/result) go the other way and wipe you out. There's an element of randomness and variables you can't control or predict.
Technical analysis and fundamental are just a distraction in these wild markets, shady exchanges, market manipulations and inside practices are not predictable and eventually destroy even the best traders.