@babs10 https://www.healthline.com/health/managing-osteoporosis/secondary-osteoporosis#causes

What causes secondary osteoporosis?
Secondary osteoporosis may be caused by certain health conditions, drugs, or lifestyle factors. Common causes include health issues such as:

diabetes
hyperthyroidism
hypogonadism
chronic kidney disease
celiac disease
chronic liver diseaseTrusted Source
inflammatory bowel disease
eating disorders
cancer
bone-marrow-related disorders
gastrointestinal disorders
organ transplantation
Other causes
In addition to health conditions, there are many other things that may affect your bones and lead to osteoporosis, such as:

Medications
Drugs that raise the risk of osteoporosis include:

steroids such as:
corticosteroids
glucocorticoids
hormone treatments such as:
thyroid hormone
medroxyprogesterone
mood disorder treatments such as:
selective serotonin reuptake inhibitors (SSRIs)
lithium
seizure treatments such as:
carbamazepine
phenytoin
Drugs to prevent organ transplant rejection, such as:
cyclosporine
tacrolimus
Other medications such as:
antiretroviral therapy
heparin
furosemide
proton pump inhibitors