I havn't had this since wrestling season which ended in February. Basically what knee effusion is when you overstress your knee and it gets swollen from the fluid build up inside your knee. Well last week I had a heavy lifting day and I noticed my knee was swollen a little. This causes problems if the fluid gets in a certain spot and I have to press on it to make it disperse. It doesn't hurt when I walk or run but sometimes when I land on it the fluid can cause discomfort until I stretch my knee out or rub the knee itself. Can anyone give me advice on what to do when this happens so it will go away and how to prevent it? It can get really annoying when I land on my leg and the fluid is in a certain spot that makes it a little painful.