Night sweats may be caused by tuberculosis, lymphoma, and hyperthyroidism. 1. Tuberculosis: Mycobacterium tuberculosis complex infection is the main factor leading to the patient’s illness, causing the patient to have a prolonged low-grade fever, accompanied by fatigue, night sweats, weight loss, loss of appetite and so on, with the development of the disease, there will also be fever, cough, chest pain and so on. 2. Lymphoma: due to the influence of infection, immune factors, heredity and physical and chemical factors, it causes patients to have night sweats at night, accompanied by fever, emaciation, and may also damage tonsils and gastrointestinal tract. 3. Hyperthyroidism: This disease is mainly caused by the increase of thyroid hormone secretion due to the synthesis of hyperthyroidism and the release of thyroid hormone into the blood caused by the destruction of the thyroid gland, resulting in night sweating at night, accompanied by palpitations, fear of heat, restlessness and insomnia, and easy to be agitated, and in women, there is also scanty menstruation and other manifestations. It is recommended that patients go to the hospital in time, under the diagnosis of the doctor, according to the patient’s condition, to take targeted treatment.