Also known as: Osteoporosis - causes and Low bone density - causes
- During your life, your body continues to both reabsorb old bone and create new bone. Your entire skeleton is replaced about every 10 years.
- As long as your body has a good balance of new and old bone, your bones stay healthy and strong.
- Bone loss occurs when more old bone is reabsorbed than new bone is created.
- For women, a drop in estrogen at the time of menopause is a major cause of bone loss.
- For men, a drop in testosterone as they age can cause bone loss.
- You do not eat enough high-calcium foods
- Your body does not absorb enough calcium from the foods you eat
- Your body removes more calcium than normal in the urine
- Drinking alcohol. Too much alcohol can damage your bones. It can also put you at risk of falling and breaking a bone.
- Smoking. Men and women who smoke have weaker bones. Women who smoke after menopause have an even higher chance of fractures.
- This keeps the muscles and bones in their hips and spines from being used or bearing any weight.
- Not being able to walk or exercise may lead to bone loss and fractures.
- Hormone-blocking treatments for prostate cancer or breast cancer
- Some medicines that are used to treat seizures or epilepsy
- Glucocorticoid (steroid) medicines, if they are taken by mouth every day for more than 3 months, or are taken several times a year
- Gastric bypass (weight-loss surgery)
- Cystic fibrosis
- Other conditions that prevent the small intestine from absorbing nutrients well
Your Changing Bones
Your body needs the minerals calcium and phosphate to make and keep healthy bones.
Sometimes bone loss occurs without any known cause. Other times, bone loss and thin bones run in families and the disease is inherited. In general, white, older women are the most likely to have bone loss. This increases their risk of breaking a bone.
Brittle, fragile bones can be caused by anything that makes your body destroy too much bone, or keeps your body from making enough bone.
Weak bones can break easily, even without an obvious injury.
Aging and Bone Loss
As you age, your body may reabsorb calcium and phosphate from your bones instead of keeping these minerals in your bones. This makes your bones weaker. When this process reaches a certain stage, it is called osteoporosis.
Many times, a person will fracture a bone before they even know they have bone loss. By the time a fracture occurs, the bone loss is serious.
Women over age 50 and men over age 70 have a higher risk of osteoporosis than younger women and men.
Your Lifestyle and Bone Loss
Your body may not make enough new bone if:
Certain habits can affect your bones.
Younger women who do not have menstrual periods for a long time also have a higher risk of bone loss and osteoporosis.
Low body weight is linked to less bone mass and weaker bones.
Medical Disorders and Bone Loss
Many long-term (chronic) medical conditions can keep people confined to a bed or chair.
Other medical conditions that may also lead to bone loss are:
Sometimes, medicines that treat certain medical conditions can cause osteoporosis. Some of these are:
Any treatment or condition that causes calcium or vitamin D to be poorly absorbed can also lead to weak bones. Some of these are:
Talk to your health care provider about your risk for bone loss and osteoporosis. Find out how to get the right amount of calcium and vitamin D, what exercise or lifestyle changes are right for you, and what medicines you may need to take.
Cosman F, de Beur SJ, LeBoff MS, et al. Clinician's guide to prevention and treatment of osteoporosis. Osteoporos Int. 2014;25(10):2359-2381. PMID: 25182228 www.ncbi.nlm.nih.gov/pubmed/25182228.
De Paula FJA, Black DM, Rosen CJ. Osteoporosis and bone biology. In: Melmed S, Polonsky KS, Larsen PR, Kronenberg HM, eds. Williams Textbook of Endocrinology. 13th ed. Philadelphia, PA: Elsevier; 2016:chap 29.
Maes C, Kronenberg HM. Bone development and remodeling. In: Jameson JL, De Groot LJ, de Kretser DM, et al, eds. Endocrinology: Adult and Pediatric. 7th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 60.
- Review date:
- February 05, 2016
- Reviewed by:
- Brent Wisse, MD, Associate Professor of Medicine, Division of Metabolism, Endocrinology & Nutrition, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- 2008 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.