I had them in both legs in June, it was very painful. Pain was the only real symptom. My legs started feeling stiff one night and I woke up the next morning and I could barely walk. I went to the hospital they sent me home with painkillers and told me to come back if it got worse or didn't go away. I had them for a week and my feet started to swell, then they properly diagnosed them. But mine were in the calves and in both legs, which is very rare. They gave me 3 months of heparin injections, because people with UC can't take coumadin.