Are you referring to a human or an animal? If human most swelling is on lower limbs, mainly ankles & can be controlled by the prescribing of diuretics (water pills) which causes the body to pass more urine than usual & so eliminates the collection of fluid in the body. Your doctor is the person to answer this question & you should see him for a diagnosis. It is important that you get this sorted a.s.a.p. as it can be caused by several conditions & can be a symptom of circulation problems as well as other things. He will prescribe the best treatment for this problem depending on the diagnosis but please do see a doctor & don't accept answers from lay people on this site. If the problem is with a pet, please consult your vet...... spinner.