Understanding Osteoporosis What Is It

As the end of the year approaches, I hear about falls notably more often in the clinic. Surprisingly many people have slipped on ice, or fallen while standing on a chair to put something up. With the same impact, if the bones are sturdy it ends in a bruise, but if there is osteoporosis the wrist or spine breaks easily. Osteoporosis is a disease that requires more caution, as it often shows no symptoms in everyday life and first reveals itself in the form of a fracture. In this article, from the perspective of the exam room, I will walk through exactly what osteoporosis is, why it is deeply linked to menopause, and how it is diagnosed and prevented.

Osteoporosis refers to a state where the bone mass that makes up the bones decreases and the microstructure weakens, so that they break easily even with a small impact. People often think of bone as a hard stone, but in fact bone is living tissue that endlessly repeats a process of being made and resorbed throughout life. Osteoblasts that make new bone and osteoclasts that dissolve old bone strike a balance to regenerate bone.

When this balance breaks and the bone being resorbed exceeds the bone being made, bone loss begins, and when its degree worsens it leads to osteoporosis. The International Osteoporosis Foundation defines osteoporosis as a systemic skeletal disease in which bones weaken and fracture risk rises due to reduced bone mass and deteriorated microstructure of bone tissue (International Osteoporosis Foundation, 2023).

In the clinic, the most regrettable point is the fact that once osteoporosis develops, it is hard to fully restore the originally sturdy bone. So management that protects bone before it weakens is far more important than catching up after it has already weakened.

Bone mass is not constant throughout life but draws a curve with age. It steadily increases through the growth period and usually reaches peak bone mass, the sturdiest state in one's lifetime, around age 30 (International Osteoporosis Foundation, 2023). The higher the bone mass at this point, the greater the margin when bone later diminishes with age.

Peak bone mass is determined by genetic and environmental factors together. A parent's bone density, nutritional status in youth, level of physical activity, smoking and drinking habits, all have an influence. After passing age 30, as resorbed bone gradually exceeds, bone mass begins to slowly decrease, and this natural decrease itself is an aging process that happens to everyone.

The problem is the rate of decrease. Even at the same age, a person who built up sufficient peak bone mass when young and one who did not have different starting lines. So I explain that bone health is not something to attend to only at menopause, but a subject to be managed throughout life from as early as possible. That the bodily changes after the forties are not all due to simple aging is also examined together in the article on why skin and body collapse after the forties.

The most representative cause of bone loss in women is the decline of the female hormone, that is, estrogen. Estrogen plays the role of protecting bone by suppressing the activity of osteoclasts that dissolve bone, and when this hormone sharply drops with menopause, that protective shield disappears.

The North American Menopause Society states that the main cause of postmenopausal bone loss is estrogen deficiency, and explains that bone loss progresses especially rapidly in the several years right after menopause (North American Menopause Society, 2021). In the clinic too, I often see people whose bone density test values change noticeably around menopause. So menopause becomes one important turning point in bone health.

Premature menopause, in which ovarian function stops before age 40, requires more active management from the bone health standpoint. For the causes and management of premature menopause, referring to the article on prevention and treatment of premature menopause, and for the overall bodily changes of menopause, the article on menopausal body changes and mechanisms, is helpful. Also, when amenorrhea with no period for 6 months or more persists, even if it is not menopause, estrogen may be low, so bone density checking is recommended.

The risk of osteoporosis is not determined by menopause alone. The more factors overlap, the greater the risk grows. Parathyroid hormone changes that appear with increasing age, endocrine diseases such as thyroid and parathyroid, digestive diseases that cause malabsorption, malignant tumors, some drugs, psychiatric disorders, and genetic diseases are all linked to bone loss.

The Korean Society for Bone and Mineral Research presents, as risk factors for osteoporosis, menopause, family history, calcium absorption disorders, vitamin D deficiency, drugs, lack of exercise, smoking, and heavy drinking (Korean Society for Bone and Mineral Research, 2022). The table below organizes the risk factors frequently checked in the clinic, divided by whether they are controllable.

As the table shows, even if there are hard-to-control factors, in the lifestyle domain you can do plenty. If you are curious about which risk factors overlap for you, please check the menopause check-up item, or feel free to inquire through the chat below.

The biggest characteristic of osteoporosis is that it usually has no symptoms at all. Because it is hard to notice in advance through pain or discomfort, it is often called the silent disease. As the first signal not infrequently appears as a fracture, the key is to confirm it in advance by testing when there are no symptoms.

The standard diagnosis is a bone density test measured by dual-energy X-ray absorptiometry, that is, DXA. It measures the bone density of the spine or femur and evaluates it with an index called the T-score; generally, according to World Health Organization criteria, a T-score of minus 2.5 or below is classified as osteoporosis, and between minus 1.0 and minus 2.5 as osteopenia (International Osteoporosis Foundation, 2023). The test itself is done lying down, is painless, and finishes in a short time.

If you are curious about interpreting test results and the procedure, you can find more detail in the article on how to diagnose osteoporosis and the article on the diagnosis and prevention of menopausal osteoporotic fractures. If you are a postmenopausal woman, fall under premature menopause or long-term amenorrhea, or have a family history of osteoporosis, we recommend getting a bone density test once even without symptoms.

The complication most to be guarded against in osteoporosis is fracture. Osteoporotic fractures bring pain and restrictions on daily life, and a hip fracture in old age in particular can make movement difficult and greatly affect overall health and quality of life. Not only individual suffering but also the burden of care and social cost rise together.

In clinical experience, a person who has once had an osteoporotic fracture tends to have a higher risk of fracture in other sites as well, so more active management is needed. A fracture is not simply an event that ends when the bone knits, but can become a starting point that affects the subsequent activity level and the entire recovery process.

So in the clinic I also emphasize "an environment where you do not fall." Tidying up the environment that invites falls, like a slippery bathroom floor, dark stairs, or untidy electrical cords, is the realistic first step in fracture prevention. The overall picture of bone health management after age 50 can be examined together in the article on bone health for women over 50.

Because osteoporosis is hard to reverse once it progresses, prevention is more important than anything. Fortunately the core of prevention is not grand. A balanced diet, regular exercise, and appropriate calcium and vitamin D intake form the basic axis.

The Korean Society for Bone and Mineral Research recommends sufficient supply of calcium and vitamin D for adults aged 50 and over and postmenopausal women, and explains that since the average calcium intake in our country tends to be insufficient relative to the recommended amount, increasing calcium intake through food is the priority (Korean Society for Bone and Mineral Research, 2015). Vitamin D too plays an important role in maintaining bone health, so maintaining an appropriate level is recommended. For exercise, weight-bearing exercise that gives moderate stimulus to bone, like walking or light strength training, helps.

• Take in calcium-rich foods, and if lacking, consult about supplementation
• Check vitamin D level and maintain an appropriate range
• Steadily do weight-bearing exercise such as walking and strength training
• Quit smoking and avoid heavy drinking
• Around menopause, get bone density tests regularly

For postmenopausal women, hormone therapy may help prevent bone loss, but since the benefit and risk differ according to individual health status, it must be decided through a specialist consultation (North American Menopause Society, 2021). The cases and methods where hormone therapy is needed can be found in the guide summarizing when hormone therapy is needed and the menopausal hormone care item.

Osteoporosis is a disease with a better outcome the earlier you attend to it when there are no symptoms. If you are around menopause or have risk factors such as amenorrhea or family history, please do not vaguely put it off but check the timing of testing once. If you are curious about the check-up and management direction that suits you, please inquire about a bone health check through a chat consultation.

Written by: Lee Dong-hee, Director · OB/GYN Specialist · View physician profile

First published December 29, 2023 · Last reviewed May 30, 2026

References: International Osteoporosis Foundation (2023), North American Menopause Society (2021), 대한골대사학회 (2015, 2022)

This article is intended to provide general health information and is not a substitute for individual diagnosis or treatment. If you have symptoms, please consult through a medical visit.