Yes! While most deep clots is are characterized by swelling, pain, and discoloration of the area, a patient may not know if they have other conditions. Some of these include injury to the area, muscle tears, history of swelling or poor circulation. Seek medical advice if these symptoms occur as a delay in diagnosis may result in problems like clots in the lung or pulmonary embolism.
Absolutely. It is entirely poossible to have a DVT and not know it. It is estimated that 3% of all dvts produce no symptoms whatsoever. As dr. Toppin said, there are also other things that can be confused with dvts that can make you think that you don't have a DVT when you actually do have one, and vice versa. If you are worried that you might have one, you should get it checked out.