Lymphedema can first appear after cancer treatment can be diagnosed relatively easily by confirming postoperative progress. If treatment is commenced quickly after outbreak and the patient learns how to carry out self-care, the condition can be managed as a minor illness thereafter. When a patient neglected the condition after diagnosis, however, the condition becomes chronic/serious and can easily lead to a hardening of the skin and skin-related complications. When this is allowed to happen, the condition is difficult to improve simply by wearing elastic stockings. When teaching patients carry out self-care, they must be educated on the basic facts about lymphedema, the causes of deterioration, and an outline of treatment. As of this writing, only a few medical institutions teach self-care to the degree needed. While compression treatment is effective, stockings can aggravate the condition if they are allowed to eats into the limbs. Ideally, a therapist skilled in lymphedema treatment is available to guide the patient on how to properly wear the stockings. Compression treatment is also effective for forms of swelling other than lymphedema. In some cases, the management of symptoms is simplified by adding compression treatment to pharmacotherapy. There is expected to be an increase in the number of medical institutions capable of ef fectively intervening to improve lymphedema and other forms of swelling.