I am looking for some advice on how to trade options in a very short term, trying to capitalize on small daily movements in stocks and increase the return by using options. I feel I am missing some basic knowledge about the price movement of options. Here is an example: If the stock will move up several percent in a day, then wouldn't the option price move accordingly (delta x price movement). The options are in the money options with less than 30 premium. What has happened is the option price does not move as expected or might even take a loss while the stock price is up from the entry price. What am I missing here?