If you do not receive the appropriate physiotherapy treatment and allow the injury time to recover you will be more likely to sprain the area again. A sprained ankle can be very painful. But t he speed of onset and the severity of the pain can vary greatly. Sometimes, the pain can be delayed, at other times it is instant. The level of pain is not always a measurement of the extent of the damage.
Some people hear a 'pop' in their ankle.
This could suggest a torn ligament. The twist is followed by swelling of the area. Rapid, significant swelling usually indicates severe damage has taken place. The swelling is caused by bleeding of the damaged tissue and the resultant bruise or discolouration is a result of gravity pulling the blood downwards. So the swelling is often situated a small distance away from the actual damaged site.