“Happy cancer” refers to malignant tumors with slow progression, which can be cured after early detection and active treatment, and the 5-year survival rate is higher than 90%, and patients can obtain long-term survival. People say lymphoma, also known as malignant lymphoma, is a “happy cancer” because Hodgkin’s lymphoma among lymphoma is a cancer with better prognosis compared to other cancers with higher malignancy, and patients have a longer survival time. Lymphoma is a malignant tumor of the immune system and is divided into two categories: Hodgkin’s lymphoma and non-Hodgkin’s lymphoma. Early treatment of lymphoma has a better prognosis, especially Hodgkin’s lymphoma, which can be clinically cured by chemotherapy alone in the early stage, with a 5-year survival rate of 94.3%. Adjunctive radiotherapy can destroy the tumor by damaging the DNA of tumor cells through ionizing radiation. However, some Hodgkin’s lymphoma will recur, so regular review is needed after cure for early detection and early treatment. Patients also need to pay attention to health management in daily life, with a nutritionally balanced diet and reduced consumption of pickled and smoked foods. Appropriate exercise will help to enhance physical fitness and prolong survival time.