Common causes of bad pituitary gland include pituitary tumor or pituitary injury that cause pituitary gland dysfunction. Symptoms include pituitary tumor compression symptoms or hormone abnormal symptoms, etc. The more common symptoms are as follows: 1. Headache: Patients may experience pain in the forehead or both temporal parts due to pituitary tumor compression, and some patients may experience pain in the corner of one eye or forehead; 2, Nerve compression: If pituitary tumor presses the optic nerve, it may cause symptoms such as vision loss or even blindness. If the tumor compresses the cerebral nerve, it may cause symptoms such as ptosis, diplopia, extraocular muscle paralysis, abnormal sensation, etc.; 3. Compression of hypothalamus: patients with pituitary tumors that compress the hypothalamus may develop uveitis, which mostly manifests as symptoms such as polydipsia, polyuria, and irritability; 4. Pituitary stroke: if patients have symptoms of intra-pituitary hemorrhage, it may trigger pituitary stroke, which often manifests as severe headache, rapid loss of vision, intracranial hypertension, lethargy, coma, nausea, vomiting, etc. Symptoms of hormone abnormalities: 1. Abnormal secretion of adrenocorticotropic hormone: common symptoms include fat accumulation in the trunk, purple lines on the skin of the abdomen or thighs, elevated blood pressure and blood sugar, facial acne, osteoporosis, anxiety, etc.; 2. Abnormal secretion of growth hormone: if the patient is a child or adolescent, he or she often shows rapid growth in height or gigantism. If the patient is an adult and pituitary tumor affects abnormal growth hormone secretion, the patient often shows symptoms of acromegaly, such as enlarged hands and feet, excessive sweating, hyperglycemia, joint pain and increased body hair; 3. Abnormal sex hormone secretion: If the patient has abnormal sex hormone secretion, when the patient is female, she may show symptoms such as irregular menstruation, infertility, lactation or headache. If the patient is male, he may show erectile dysfunction, reduced sperm count, decreased or lost libido, breast development, etc.; 4. Abnormal secretion of thyroid stimulating hormone: If the patient has abnormal secretion of thyroid hormone, he may show hyperthyroidism, with common symptoms such as weight loss, panic, nervousness or irritability, frequent bowel movements, excessive sweating, insomnia, etc.