A low fever after lunch break, considering the possibility of cold, tuberculosis, hyperthyroidism and other diseases, it is recommended to go to the hospital to identify the cause of the disease, according to the cause of targeted treatment. 1. Cold: at rest, the body’s immune system is relatively weak, if you do not do a good job of keeping warm and lead to cold, it will lead to a low fever, can be treated through physical therapy, the use of lukewarm water to wipe the body, so that the body temperature reaches normal, and if necessary, you can also use antipyretic drugs, such as ibuprofen or acetaminophen. 2. Tuberculosis: Mostly due to their own physical condition, poor immune system, resulting in bacterial infections in the lungs, usually with low fever, fatigue, night sweats (abnormal sweating after going to sleep, waking up sweating stops), chills, loss of appetite, etc., you can use isoniazid, rifampicin, pyrazinamide, and ethambutol and other drugs for treatment. 3. Hyperthyroidism: As the thyroid gland synthesizes and releases too much thyroid hormone, symptoms such as fever and edema may occur, which can be treated with drugs such as methimazole and propylthiouracil under the guidance of a doctor. The above drugs need to be treated with medication under the guidance of a doctor to avoid adverse reactions and effects. Normally, you should pay attention to the regulation of dietary habits, you can eat more nutritious food, appropriate physical exercise, increase their own immune system.