Whether the left adrenal nodule is dangerous or not needs to be differentiated, if it is benign and non-functional nodule is usually not dangerous, malignant or functional nodule is more dangerous than the former, it is recommended to consult a doctor. Adrenal nodules can be categorized into benign and malignant nodules, functional and non-functional nodules. Among them, non-functional nodules generally have no endocrine function and do not cause endocrine disruption, so most of the benign non-functional adrenal nodules are not considered dangerous; however, when the nodules are large, they may produce pressure symptoms. Functional adrenal nodules will secrete different hormones, which may cause endocrine disorders such as high blood pressure, elevated blood glucose, decreased blood potassium, etc., and require timely intervention; or malignant nodules need to be considered for surgical treatment to avoid metastasis, which may also threaten the patient’s life; therefore, malignant or functional nodules are usually more dangerous. Patients diagnosed with left adrenal nodules should go to the hospital and ask the doctor to make a judgment.