Enlarged left tonsil without pain may be normal, but it does not exclude pathological causes such as chronic tonsillitis, tonsil lymphoma and other diseases, which can be treated by observation, drugs, surgery, chemotherapy and other methods. 1. Normal situation: tonsils are lymphatic tissues, involved in the body’s immune response, if exposed to more external stimuli, there may be tonsil enlargement without pain, mostly seen in children. This situation is normal, the patient usually have no obvious discomfort, it is recommended to observe, regular review can be. 2. Chronic tonsillitis: acute tonsillitis can be caused by repeated episodes, local tissue infection and other causes of one side of the tonsils are enlarged, and the left side of the tonsils will be enlarged without pain. If it is caused by bacterial infection, it can be treated with drugs such as cefixime as prescribed by the doctor. If chronic tonsillitis recurs, surgery can also be used. 3. Tonsil lymphoma: within a short period of time, the left side of the tonsil is enlarged without pain, and some of them also have symptoms of tonsil ulceration and bleeding. In this case, biopsy should be carried out in time to clarify the cause of the disease, and then take chemotherapy and other methods of treatment. The left side of the tonsil enlargement does not hurt, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, to clarify the cause of the disease, for treatment.