Swelling and pain at the place of injection after chemotherapy for lung cancer is usually a side effect caused by chemotherapy drugs, which causes pain and swelling. Usually, local hot compress can be applied as prescribed by doctor and treated with medication if necessary. 1. Local hot compress: If there is swelling and pain after chemotherapy for lung cancer, local hot compress can be applied to the injection site, which can reduce swelling and relieve pain. 2. Drug treatment: patients can use celecoxib capsule and ibuprofen delayed-release tablets as prescribed by doctors, which can inhibit the synthesis of prostaglandin, thus play the role of analgesia and anti-inflammatory heat dissipation and reduce the pain of lung cancer patients. After chemotherapy for lung cancer, patients with swelling and pain in the place of injection should consult doctor in time and follow doctor’s instruction to avoid delaying the condition.