Pyometra - As at the start make sure you know what your hamster's urine normally looks like. Pyometra is an infection of the womb or cervix and results in an abnormal discharge and bleeding. Sometimes a 'closed' pyometra doesn't give any signs other than a swollen abdomen or difficulty walking. Any signs like these must be assessed by a vet immediately. An ultrasound scan is NOT a reliable diagnostic tool on an animal the size of a Syrian and a tiny uterus. An 'open' and discharging pyometra may not be seen on a scan but your hamster should never bleed from it's vulva. An antibiotic such as Baytril is useful in the short term, or for elderly females. If you have a young hamster with this issue then your vet should be able to spay her. Syrians do well with surgery and anaesthetic usually so this is a good, viable option assuming your hamster is otherwise healthy. There are risks and these should be discussed with your vet. This can affect any hamster, any age, from any background, in any condition and for many different reasons.