All blood thinners (anticoagulants) can result in unintended bleeding. Although this usually is manifested with only mild bruising, serious complications such as bleeding in the stomach, intestines, and the brain are possible. Blood thinners are lifesaving drugs and can be used safely, but they need frequent monitoring to make sure that you have neither unintended clotting nor un-intended bleeding.
Less serious but more common complications of anti-coagulants include:
- Bloating and gas
- Diarrhea
- Upset stomach or throwing up
- Feeling less hungry