<prompt> All are causes of Osteoporosis, except-ThyrotoxicosisHypothyroidismChronic heparin therapyOld age  <response>: Causes of osteoporosis are : Lifestyle factors Risk increases with age Genetic factors Hypogonadal states Endocrine disorders - premature ovarian failure, adrenal insufficiency, Cushings syndrome, central adiposity, Diabetes mellitus types 1 and 2, hyperparathyroidism, thyrotoxicosis. Gastrointestinal disorders Hematologic disorders Rheumatologic and autoimmune diseases Central nervous system disorders Miscellaneous conditions and diseases like AIDSHIV, alcoholism, amyloidosis Medications - aluminum in antacids, Anticoagulants heparin, Anticonvulsants, Aromatase inhibitors, Barbiturates, Glucocoicoids , GnRH antagonists and agonists, Cancer chemotherapeutic drugs, Lithium, Cyclosporine A and tacrolimus, Depomedroxyprogesterone premenopausal contraception, Proton pump inhibitors, SSRIs, Tamoxifen premenopausal use, Thiazolidinediones, Thyroid hormones in excess, Parenteral nutrition. Reference : page 2490 Harrisons Principles of Internal Medicine 19th edition 